Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f12f799d0837c0…

MALICIOUS

PDF

72.5 KB Created: 2020-11-27 19:35:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2226466a0f22bfbdc6e0cd26a508176c SHA-1: df8ecbce379edebfc90f4c390f53f195726aebc5 SHA-256: 62f12f799d0837c00efc8e2b063fd1150c298dc42b28d95c27c9e395e021517b
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 0.9997

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://trafffi.ru/strik?utm_term=carnegie+mellon+transfer PDF link annotation
    • https://jatozaboko.weebly.com/uploads/1/3/4/5/134529560/f8cdb20ca2885a.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/a143da5d69e9.pdfIn PDF document text
    • https://dajexave.weebly.com/uploads/1/3/4/3/134352807/somenotosupiti.pdfIn PDF document text
    • https://vorabatuzawudun.weebly.com/uploads/1/3/4/5/134582038/4576263.pdfIn PDF document text
    • https://kuvetofuba.weebly.com/uploads/1/3/4/6/134607492/fawupew_tawikeli_mixesixov_susurulaxugurin.pdfIn PDF document text
    • https://meboguvogo.weebly.com/uploads/1/3/1/4/131437667/baweze.pdfIn PDF document text
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/wurakogewokuvakakezo.pdfIn PDF document text
    • https://mitogisavubok.weebly.com/uploads/1/3/4/0/134019676/mokefemodiwa.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/likadojivivofu/57134415129.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/36901343698.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/83552822664.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC897 4992 bytes
SHA-256: 26b9e3c3a5a53afc9abf01d6f58c3ff3c757b3c53ef966d5c3f6bd0e5c90706d
font_01_sfnt_off0000d979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD979 11216 bytes
SHA-256: 82e191ba2a901fbc3bdca09e0e1e4fef1ded385e76e37d3d17bf4586dca69f8b
font_02_sfnt_off0000ffd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD4 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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