Malicious PDF — malware analysis report

Static analysis result for SHA-256 458d20e91a545154…

MALICIOUS

PDF

125.9 KB Created: 2021-05-26 04:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a1628c41c20c30ed806af8d431720097 SHA-1: 47d9107adbdbf10158c161b21469491589a11f85 SHA-256: 458d20e91a5451546852a0369b4adb846ae2cd20a37809fe4aa431b6fd7a3ed7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9677

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gimoguvi.ru/strik?utm_term=biblia+paralela+ingles+espa%25C3%25A3+ol+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404990/normal_5fdb233374f43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374835/normal_604d2ca507887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461511/normal_60432c40b5d64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383156/normal_5fdc42caa5ac0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465269/normal_606934f1de11f.pdfIn PDF document text
    • https://kibasixeb.weebly.com/uploads/1/3/1/4/131438563/d49e2d1.pdfIn PDF document text
    • https://wapofaxuza.weebly.com/uploads/1/3/5/9/135992917/jexizuf-revepof.pdfIn PDF document text
    • https://folumenudi.weebly.com/uploads/1/3/2/6/132681426/pagapip.pdfIn PDF document text
    • https://bepevefobe.weebly.com/uploads/1/3/4/6/134699504/80cfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376088/normal_604a4d485cf0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417995/normal_5fca4964aff0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424341/normal_6039bbba2756e.pdfIn PDF document text
    • https://tajifajedu.weebly.com/uploads/1/3/1/6/131637014/6941167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372719/normal_5fea34bc58bcd.pdfIn PDF document text
    • https://sefizofemaj.weebly.com/uploads/1/3/4/2/134266575/lasedebupukuga.pdfIn PDF document text
    • https://vuwawirekexaz.weebly.com/uploads/1/3/0/9/130969699/8c80bce.pdfIn PDF document text
    • https://wazexexa.weebly.com/uploads/1/3/5/3/135305699/vemozajis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384296/normal_5ffb534dd0a88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387817/normal_606b85fbb53a6.pdfIn PDF document text
    • https://bewevirat.weebly.com/uploads/1/3/1/4/131437926/b15f424ca9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465123/normal_6012f9f11eddb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/xixonu/research_report_on_infrastructure_sector_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/zawanig.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/jorumigugupakusa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001189d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189D 7148 bytes
SHA-256: 9bf01cdde093de0ef8e21cd74a4d1c5a7d196ea6154fa8c21f4d8c631ac10bd6
font_01_sfnt_off00012aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA7 5484 bytes
SHA-256: 2549264b1c3f3d0817761cd3523efb7fce71ca3ecd950d8877aed4b2bf3df1ae
font_02_sfnt_off00013ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DED 5716 bytes
SHA-256: fa6a29dbe2faa5284af67f70a9b5b4f95503625e3a475f3b32011bb46b4d7ca0
font_03_sfnt_off000150d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D2 2752 bytes
SHA-256: df654c9c2aafd3a3436b92900db38dee2e8576889549886b12b8a917b2485449
font_04_sfnt_off00015c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C69 7048 bytes
SHA-256: a5c35f8cccdcc9e38b62c8b2f714164baf6940e5ff2433a52b44fbaaadf2e104
font_05_sfnt_off00016f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F95 21292 bytes
SHA-256: 6f2eaa223a2777a025d72e764107aea080380c72b53530949ca1232b4bebb467
font_06_sfnt_off0001a9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9C3 18652 bytes
SHA-256: c3c6eaa1b4296e4ee5363bdff18b7d4915d84c198add3177e393319a1622a0e5
font_07_sfnt_off0001c86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C86B 2604 bytes
SHA-256: c0e5eb7d0ab9a16430f792b265b343253a0c0159460f95a41b44f9cfbb1a65bf
font_08_sfnt_off0001d2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2D8 6820 bytes
SHA-256: 2109ad0a83bed9b56bc9b3fb089fe49e468f5719c2f05aebf50b7ca75d26f154

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