Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d1ea31978f2ad2…

MALICIOUS

PDF

73.9 KB Created: 2021-03-25 08:08:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 687f90a11bd2ac0eac365ac6f3030b91 SHA-1: 0b3af88f128c62d2e79c58d13815467c059ce4ae SHA-256: c5d1ea31978f2ad2d98f79a0caa602172ae6f2b4898db32fe588ce553e0528cd
186 Risk Score

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 0.9998

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
  • 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://dafemum.ru/wix?keyword=depaul+resume+guide PDF link annotation
    • https://budawimimizav.weebly.com/uploads/1/3/0/8/130873912/7641779.pdfIn PDF document text
    • https://cdn.sqhk.co/ladatiziz/gdwichf/19266564328.pdfIn PDF document text
    • https://tebugusenaj.weebly.com/uploads/1/3/4/8/134870623/4633292.pdfIn PDF document text
    • https://xijozidirosem.weebly.com/uploads/1/3/4/7/134712871/4177011.pdfIn PDF document text
    • https://nibawomufexax.weebly.com/uploads/1/3/4/3/134371272/8a912c0c76e4.pdfIn PDF document text
    • https://witiwalaligizis.weebly.com/uploads/1/3/1/6/131607575/5b8be.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/lihgzNy/digikala_laptop_gaming.pdfIn PDF document text
    • https://cdn.sqhk.co/rogudokives/Hjd2iff/rokob.pdfIn PDF document text
    • https://gavebinakufir.weebly.com/uploads/1/3/2/3/132302735/fafofa-gipasixikoz.pdfIn PDF document text
    • http://fezufizibum.mypressonline.com/automatic_vs_manual_transmission.pdfIn PDF document text
    • https://woxawilafuzuve.weebly.com/uploads/1/3/4/6/134669094/8503284eff.pdfIn PDF document text
    • https://cdn.sqhk.co/livixugakuf/ehjjfic/59753601852.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/jhfQGhh/spectroid_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/7jbkMja/81661070759.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zexozavo/scratch_1._4_linux.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/63978025684.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/52611060708.pdfIn PDF document text
    • http://rabelinowizufe.myartsonline.com/ap_psychology_memory_test.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31A 5280 bytes
SHA-256: 6b854b004c779f608faa1a11ba65de3b1eb89d460f7a21a99c61e1ef84f434a8
font_01_sfnt_off0000f4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 10988 bytes
SHA-256: d7dbf9bbb66eab9fa3c877954c52796a0da89084b7ce558cbe1d3ac5a78160fc

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