Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f20b804b22b7a81…

MALICIOUS

PDF

82.0 KB Created: 2021-05-05 14:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cb2b6fddd527d46059aac8b08144861e SHA-1: fba875504c3eca4f68535ebf4341c09157591ace SHA-256: 3f20b804b22b7a81e12f26f67637325c3d23c5472358311551739bdd7cc10010
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed for SEO manipulation or phishing. The primary URL, 'https://kuzutuzo.ru/strik?utm_term=how+much+do+tesco+night+shift+workers+get+paid', is presented as a search result for employment information, a common lure for phishing attacks. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly indicate malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://kuzutuzo.ru/strik?utm_term=how+much+do+tesco+night+shift+workers+get+paid PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446034/normal_60541f06d0fe1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418391/normal_600a583b44e6f.pdfIn PDF document text
    • https://gefivepuli.weebly.com/uploads/1/3/4/6/134620723/36406c.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/N8iepKd/482392697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500001/normal_6016085528a59.pdfIn PDF document text
    • https://veguxalefimas.weebly.com/uploads/1/3/1/3/131382166/9815159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486045/normal_602704a4d57e7.pdfIn PDF document text
    • http://agent-spv.space/zovabinamevoputoqavi2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424361/normal_6039107373db7.pdfIn PDF document text
    • http://stankovit.ru/xaxonukoziginil96tj7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391642/normal_5fe2f515b5f2f.pdfIn PDF document text
    • http://gradstroy.su/bike_game_hdag8vn.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/hM1gigh/lisigedamezegativenativu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483331/normal_5fd8b396db31e.pdfIn PDF document text
    • https://gilawidukawopux.weebly.com/uploads/1/3/2/7/132741225/5b264169ba13.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/fJgfPi4/wifaxajovofunam.pdfIn PDF document text
    • http://mon-cmbretagne.com/tebularebanew3j1g.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/figugipopar/lego_harry_potter_1-4_hogwarts_free_play.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/aula_ingles_bully_android.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/domuwaniwatuwa.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_off0000fec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC8 5656 bytes
SHA-256: 8b51d306f428d0beb031add5977b9c0fe09e4c64682ce1a5e06055ee3b906e77
font_01_sfnt_off000111ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111ED 11696 bytes
SHA-256: c175ab9ca8467b5e8c765f83085452faae47d150547659dfc13cc29adb89cc5a

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