Malicious PDF — malware analysis report

Static analysis result for SHA-256 21186c0264d4be62…

MALICIOUS

PDF

92.5 KB Created: 2021-02-16 04:08:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1bd0d5d4cfa3f4709f5ae1f0a6450bc2 SHA-1: 2264ac90695e13f81de8e7156385d020e203a3c8 SHA-256: 21186c0264d4be627fb81b41d91dc4399ecf3003c32ef3b6457b32f1ad07a5dc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to a book summary, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=mrs+peregrine+home+for+peculiar+book+summary PDF link annotation
    • http://chestlune.online/lesukotuzapuzaworanimup9rjs9.pdfIn PDF document text
    • http://christinaanddavid2019.com/lanowilulavuvawifejolenozz5cwh.pdfIn PDF document text
    • http://lazerepil.site/kosunurajufijikugajomilohek7s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529977/normal_5ff3ee8850314.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462046/normal_5fc7ada1cde00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403143/normal_5fd34d688e5b6.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/chaH0id/light_meter_app_for_plants_android.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/DiiAJic/robewez.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/aKjZu6o/kuzugaj.pdfIn PDF document text
    • http://braco.ru/bridger_bowl_ridgejug8l.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/ski_jump_game_online_freed8lcu.pdfIn PDF document text
    • http://mini-camera-super.club/duwufuviljae0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387410/normal_60171835b46aa.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/Q8fNYhh/project_mutant_zombie_apocalypse_mod_apk.pdfIn PDF document text
    • http://xtw2.club/zasirawigisiwosenopasa3lb3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410030/normal_5fe9ffaab0b0a.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/jolunenafobuw/sheets_of_plywood_bunnings.pdfIn PDF document text
    • http://pupuwejerew.epizy.com/zudinixem.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/arupu_audio_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/free_camping_list_template.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_off00012cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDF 5740 bytes
SHA-256: 2be996a69f105668ee570dfbccbca4c9ee4934d868d12f0b5d8160767b48c196
font_01_sfnt_off00014054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14054 11020 bytes
SHA-256: 6bf8b6e012677190b277f60e54be0676454525aa870278346e7e37fca26788fd

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