Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01a46c5d16f765a…

MALICIOUS

PDF

108.2 KB Created: 2021-01-12 16:39:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ad8479d7166211d70b813fe36c164ffb SHA-1: 35ffe344310bff8aaba08912e168c9248c9a064e SHA-256: f01a46c5d16f765a1f78aacfc83a4f27dfe81aa2d6a490ef1b438b8b747109b9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominent URL pointing to a suspicious domain ('traffnew.ru'). Heuristics indicate this PDF is a link farm hosted on disposable domains, and ML classifiers and ClamAV strongly flag it as malicious, specifically as a phishing or trojan delivery mechanism. The presence of embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/123?utm_term=see+his+glory+stands+as+white+across+the+sky PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368486/normal_5f92356fe1623.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417137/normal_5feeda2d6bb0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391319/normal_5f9faf65b2e41.pdfIn PDF document text
    • https://cdn.sqhk.co/lerutefo/jeHMkgj/31700021972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376602/normal_5f8a5bc30cb23.pdfIn PDF document text
    • https://site-1178037.mozfiles.com/files/1178037/53077539401.pdfIn PDF document text
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/sifet_sedaxokexuwe_waxojagur.pdfIn PDF document text
    • https://site-1177443.mozfiles.com/files/1177443/niwiwilidonuloxima.pdfIn PDF document text
    • https://cdn.sqhk.co/xobakidanav/UggigIF/zidumifapadukusug.pdfIn PDF document text
    • https://site-1166068.mozfiles.com/files/1166068/5832700243.pdfIn PDF document text
    • https://site-1172851.mozfiles.com/files/1172851/85775089304.pdfIn PDF document text
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/dumosejuxukazerixode.pdfIn PDF document text
    • https://kenufipafalenar.weebly.com/uploads/1/3/4/6/134616414/0e5c18c8d4793.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://s3.amazonaws.com/degagaziv/84366687260.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_off00015e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E57 5348 bytes
SHA-256: 1bb61b0fe031e9d3ba1c85b2a9aa6259880d4aa4bf62d888449fd135ccd3ca08
font_01_sfnt_off0001708e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1708E 11280 bytes
SHA-256: eb384095c9d3eccc9fc2465ac60a7ec5d8fe4c6170d3702d8f96f7fe2e755092
font_02_sfnt_off00019520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19520 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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