Malicious PDF — malware analysis report

Static analysis result for SHA-256 36465f927403dc18…

MALICIOUS

PDF

71.3 KB Created: 2021-03-28 23:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ee27db2473274c0ff88ae27ad368714a SHA-1: 70bf729e0e3b9a71a1fbfd3845d9bbd9f9400e27 SHA-256: 36465f927403dc187bf5cd4b57f4922d8ca21b37c7e8038758319b276c79166e
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains, indicating a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution, disguised as a free book download. No scripts were extracted, but the presence of external URIs and the heuristic firings point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/award?keyword=sherlock+holmes+books+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443576/normal_60419a2845c90.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/deHoHW2/necromancer_robot_raised_by_wolves.pdfIn PDF document text
    • http://delunabiwefepef.22web.org/genetic_mutation_answer_key_pogil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480898/normal_6040af4a89006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447278/normal_5fea417d8ec18.pdfIn PDF document text
    • https://cdn.sqhk.co/pujazojiwixi/ihghwpE/bewavukixotamiban.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/mZdgejb/52679348274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5fd958e475a6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369516/normal_5fefa5e4ae452.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/gfjcNiW/flu_game_12_outfit.pdfIn PDF document text
    • http://tegekagag.22web.org/angela_carter_the_bloody_chamber_and_other_stories.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375076/normal_5fe490789801d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474450/normal_605e0ed51cbf6.pdfIn PDF document text
    • http://kulokozataxat.22web.org/3662503454.pdfIn PDF document text
    • http://wilugobosisur.22web.org/72116580828.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/aCQKKhd/mega_farmers_in_south_africa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416938/normal_60127accbec13.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/gyNngg6/90659975706.pdfIn PDF document text
    • https://cdn.sqhk.co/kolokejo/ddbjjhf/dream_city_metropolis_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/nilamemiw/NhcjeNk/durowulipuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://medozazi.epizy.com/21697406073.pdfIn PDF document text
    • http://rovuwuruw.epizy.com/complete_ukulele_chords.pdfIn PDF document text
    • http://pifujisebakiju.epizy.com/i_found_love_cindy_s_song.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_off0000d6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FB 5792 bytes
SHA-256: c311705dfbf3606e67d3faf878a69b8a8f5a53fe606d54a6da1425b5758a1567
font_01_sfnt_off0000ea96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 11664 bytes
SHA-256: 893fecdc0a47f2b71507b385933a950286935472e88f47a4aa37b05c4c4cf3b1

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