Malicious PDF — malware analysis report

Static analysis result for SHA-256 40281dcfb345a8c0…

MALICIOUS

PDF

76.1 KB Created: 2021-05-07 21:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e0a800a9190f0776e0ae49750295012a SHA-1: 6e0a1fa12161b2ad4c3b277b13b189a6ae303251 SHA-256: 40281dcfb345a8c096e274e377c753746717546d923fe7ba424bb957d95b521d
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. The primary malicious URL identified is https://mezovuduz.ru/strik, which is likely used to host phishing content or deliver further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=2005+dodge+ram+1500+4+door+for+sale PDF link annotation
    • http://momarivido.mypressonline.com/midil.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/hjageig/star_traders_frontiers_ship_builder.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493209/normal_600fb1b95c479.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/ehbjchj/49746042435.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/akcgdih/mama_drama_gardner_quad_squad.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/solenoide_adn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408599/normal_602b42d447b1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456984/normal_6034e53b3f538.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_f91e9f07fba4412e8b8fe628cab852ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbe070f1-28e9-4abb-8f4a-bc6c2505cd63/91677760882.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/30135686137.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/al_quran_indonesia_apk_terbaik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fa72e2f-4c5d-4a47-ae50-a8d1f3ca269c/51967660328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e38421-0b7c-444f-afc7-d171c843ca8c/gilupovategukudu.pdfIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_850337e465864036a13ac711fee6190e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/letexavujuwadogagomox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/105d5c0a-08ad-47f4-8992-0e63b7823c13/mixuzofufefovenad.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_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 5672 bytes
SHA-256: e3b10fd5c06937d3dc3363555032950a3544eef9242a23692337d3db6c21f3ad
font_01_sfnt_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 10612 bytes
SHA-256: 02a43252b41e8cbe17221d09be3ce12016498ea4534474230c6bafd215ac79cf

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