Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7d79452f1c36b6…

MALICIOUS

PDF

92.6 KB Created: 2021-02-09 23:34:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 88a8a26d3e056fd1f35810b2263f4c28 SHA-1: 71efd01d9de3851d0efcaca4dbb9016432286119 SHA-256: ae7d79452f1c36b6edb331711a024b79b8bd2070fdc54f73b79b43ac5ad0a9d7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, one of which is `https://druttle.ru/aws?utm_term=ancient+egypt+puzzles+worksheets`. The presence of embedded URLs and the link farm behavior suggest an attempt to redirect users to potentially malicious sites or for SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://druttle.ru/aws?utm_term=ancient+egypt+puzzles+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402963/normal_601a789ec6a51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385204/normal_60201c6d08256.pdfIn PDF document text
    • https://cdn.sqhk.co/nagebagem/6pjfLg7/feudal_system_social_hierarchy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417990/normal_5fec3177787ca.pdfIn PDF document text
    • http://politach.com/2020_turkce_pop_mp3_indir70ned.pdfIn PDF document text
    • http://drawer.icu/musician_death_motorcycle_accidentfboog.pdfIn PDF document text
    • http://dommasters.site/bayonetta_smash_bros_guideww1cy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454179/normal_6011c276e3f65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379974/normal_5fc80f4f18003.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408596/normal_5fddc0223a10a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386594/normal_5ff316d1724d5.pdfIn PDF document text
    • http://prodson.fun/jokutibojusebutewud0s.pdfIn PDF document text
    • http://grigolia-studio.ru/12961081195hxu8r.pdfIn PDF document text
    • http://wownatural.fun/texovizalegilev2yh3k.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/qkjhji7/97137818253.pdfIn PDF document text
    • https://cdn.sqhk.co/lisesemafo/heghpwS/89855755332.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/xurixado/sifisuzolo.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/telugu_bhakti_geethalu_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/trustpilot_report_fake_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/ragnarok_m_eternal_love_blacksmith_skill_guide.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_off00011542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11542 5280 bytes
SHA-256: 5377f54c03ab2689ad6f17bf0dab7d1851e8fbe7b2b62b316ddc9b8b740fd9eb
font_01_sfnt_off00012761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12761 11496 bytes
SHA-256: 1add33c73ca06595d6e756d60b98654da070a9dc43bc6225f54b6fccb06b9e66
font_02_sfnt_off00014e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E36 16076 bytes
SHA-256: ebf689d51ed3b58778ccf7ee11078071a21d17262a377a1c882137165fc51b0d

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