Malicious PDF — malware analysis report

Static analysis result for SHA-256 281a3bcea96b0c98…

MALICIOUS

PDF

71.8 KB Created: 2021-04-03 16:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 41e03c28561504ba7dba172d26d9845c SHA-1: 5a6f8dbda7d790d8f6d8081f544bb87980ad1ac0 SHA-256: 281a3bcea96b0c98fb478432b58023ea9053a24c594e96168b7af8ec377ce8c5
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 0.9998

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://kuzutuzo.ru/wix?keyword=similar+polygons+worksheet+7-2 PDF link annotation
    • https://cdn.sqhk.co/mujutuzidip/AhjajdW/47847061646.pdfIn PDF document text
    • https://jekaboda.weebly.com/uploads/1/3/5/3/135398795/jabemi.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/ijMLgeN/football_strike_soccer_hero_free_football_games.pdfIn PDF document text
    • http://albatros-trans.ru/album_songs_tamil_2017_love1oak4.pdfIn PDF document text
    • http://ptmonline.ru/forces_and_motion_escape_room_answer_keyeul0j.pdfIn PDF document text
    • http://itayoga.space/20150988245k6tvk.pdfIn PDF document text
    • https://rokumewa.weebly.com/uploads/1/3/4/5/134529377/b986d0b3c9c79.pdfIn PDF document text
    • http://nyvelsets.online/zufarovaooe6.pdfIn PDF document text
    • http://redirerer.medianewsonline.com/teweve.pdfIn PDF document text
    • http://zosujisa.22web.org/7926007010.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_af55c1f2cbcd4c2a8e866ad4b9d47722.pdf?index=trueIn PDF document text
    • http://gitodake.myartsonline.com/82067062861.pdfIn PDF document text
    • http://fixafuxebiwi.rf.gd/best_french_to_english_dictionary_app.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_ddabc5be141d4628b39accc0a953a9dc.pdf?index=trueIn PDF document text
    • https://e0529b0e-ffd4-46ae-8a9e-348c3aa8e3ae.filesusr.com/ugd/27320f_4908cb13df494de18c943c892e957104.pdf?index=trueIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_bfb7746355a84da4851cf7dfeacd5588.pdf?index=trueIn PDF document text
    • http://kixasudasiwub.epizy.com/maytag_front_load_washer_error_codes_f02.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB35 5840 bytes
SHA-256: bc75b1b40d41fd58c19dd15cebfe759a23a5eb32c972bde0ab17ef7c071b4e5d
font_01_sfnt_off0000ef0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0F 10308 bytes
SHA-256: e23280d7e66611e96c096f2ea42432711dc90d683a52db3c327851301498f7a1

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