Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd98bafb88bb41b6…

MALICIOUS

PDF

72.8 KB Created: 2021-05-31 21:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 362ebdcb9721832eb481361b0e6e170d SHA-1: 2e98e0239fd2444ed82c9f2b949b8a6ac214e815 SHA-256: fd98bafb88bb41b631ee807663d6aab983c83ddd2d26520f51513a0ee295fca7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://crewmak.ru/pbw?utm_term=formato+pagare+2020+pdf+para+imprimir PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476123/normal_60112b40cf518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4859805/normal_6036c400c145b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384459/normal_603220b4b3b83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425929/normal_60647f18a287a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379719/normal_60022223d1548.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lakebimutep.pbworks.com/f/45837877842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef82d75-8be0-40c4-bf1f-7574c33b440e/how_do_you_dilute_hair_dye.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10db89bf-8bc1-4935-bc51-83a1e042acfb/pokemon_white_2_extreme_randomizer_rom_download.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/50493482842.pdfIn PDF document text
    • http://natizasex.pbworks.com/w/file/fetch/144411603/esquadrao_suicida_acerto_de_contas_online_dublado.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/examenes_resueltos_potencias_y_raices_1_eso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dea7fe6-d026-488e-94b1-53b31b1bb0e5/fokigopupelef.pdfIn PDF document text
    • http://viluxese.pbworks.com/f/soccer_heads_championship_2014_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c40f2f9f-a6d2-4b5b-908f-12e344bee4dc/whats_sub_mean_in_anime.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/f/what_is_isentropic_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4ec0d12-3c4f-4dd0-b9dc-e2cb905a6b6a/boss_dr-550_wikipedia.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/craftsman_25cc_4_cycle_weed_eater_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/321456db-1f03-44dc-8b75-185882525697/what_pilates_exercises_to_avoid_with_scoliosis.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_off0000dda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA0 5380 bytes
SHA-256: 750636c980a28db43cf4e320560139da99a243961dd7286f65798823794b9408
font_01_sfnt_off0000efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 11828 bytes
SHA-256: 6c387c96b765ef1d38006bc2232cd55e9923b071ed38b0d0d074268d11f6b917

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