Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35a0f1b2573399e…

MALICIOUS

PDF

82.6 KB Created: 2021-01-06 04:23:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 58f9beec6965d0176a2872a16aab9372 SHA-1: 9183b7ea096a8b3f73d49405e33452c743940a22 SHA-256: e35a0f1b2573399eaca02819f4fa269a146e447b64bec30be868cee65f4d6f76
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, including a critical alert for linking to known malicious redirector infrastructure. The document contains a large number of embedded links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. While no scripts were extracted, the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=el+acuerdo+de+bretton+woods+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392658/normal_5f9c41b42c8b5.pdfIn PDF document text
    • https://bapepewemeg.weebly.com/uploads/1/3/4/7/134702997/koronef-dosezomiwugevub-tuvep-gotutina.pdfIn PDF document text
    • https://cdn.sqhk.co/pujapipiwat/goThbjd/pixelmon_mod_mcpe_2018.pdfIn PDF document text
    • https://nuzojumikosa.weebly.com/uploads/1/3/0/8/130814298/feb7f43b4fb0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377679/normal_5fd27d6a49dad.pdfIn PDF document text
    • https://cdn.sqhk.co/tixelila/kJOg2jb/92692239195.pdfIn PDF document text
    • https://cdn.sqhk.co/wepaxuwelusu/jcwthbe/come_fare_gli_stickers_su_iphone.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/4169262.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/beputubi.pdfIn PDF document text
    • https://dojosofezi.weebly.com/uploads/1/3/5/3/135390984/vuriwa-muwopopegi-jatesugebidulik-bokun.pdfIn PDF document text
    • https://zavebunerug.weebly.com/uploads/1/3/4/3/134358754/jeterosi.pdfIn PDF document text
    • https://cdn.sqhk.co/bimeniwog/gghbhcc/police_officers_shot_this_weekend.pdfIn PDF document text
    • https://cdn.sqhk.co/jetobatu/hhgeife/shooting_bears_videos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/66fbca81-da18-430a-bc65-6c8ee29d9025/google_drive_batman_the_dark_knight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e1cbf0f-2119-47b9-85b6-b57aee39b927/levolor_faux_wood_blinds_installation.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 5172 bytes
SHA-256: 5041cfbbced4faf11333f09e4ded87130b651ec8d912cdea19914dc62003626b
font_01_sfnt_off00010ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC5 10968 bytes
SHA-256: 33b7599b37fa62d885b770f00f3d38e7e8ed54a86ea422a340068906e9e248ec
font_02_sfnt_off00012faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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