Malicious PDF — malware analysis report

Static analysis result for SHA-256 8241a188f9162706…

MALICIOUS

PDF

74.6 KB Created: 2021-02-21 17:16:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c0451a0daa7b3a8a04287e2f6169c596 SHA-1: 4a0967f0a517c26edfecc674d788a4a2973d25c0 SHA-256: 8241a188f9162706eb7fd811ffdd4747516efc759ddd1f690465f3395f0538fb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is part of a link farm designed to attract traffic, likely to a malicious site.

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://baarspo.ru/wix?keyword=ccna+portable+command+guide+3rd+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470205/normal_5fdc2f106c460.pdfIn PDF document text
    • http://usesalon.xyz/48025880844vz8qi.pdfIn PDF document text
    • http://webpost.pro/tornado_siren_testnx5v6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483359/normal_5fffdfa8c3b14.pdfIn PDF document text
    • https://cdn.sqhk.co/ferorigife/crA1Xhj/49893620741.pdfIn PDF document text
    • http://7lessons.fun/browser_video_er_onlineo1gw9.pdfIn PDF document text
    • http://cleaner-inn.club/fifth_edition_character_sheet_app_blood_hunter9tgd0.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/UwWukK5/homeschooling_options_for_high_schoolers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479462/normal_5ffb680a24ab5.pdfIn PDF document text
    • http://re-capital.ru/how_to_find_cash_flow_from_income_statementgw14b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497688/normal_6024210931576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407988/normal_60201b3a14c05.pdfIn PDF document text
    • http://vovality.club/murray_snow_blower_carburetorsqvci.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/hieigjc/handwritten_notes_apple_pencil.pdfIn PDF document text
    • http://pubggaming.online/andrea_andrassy_dnevnik_gradske_curexj1sz.pdfIn PDF document text
    • http://flymoney.net/skyscraper_2018_cast_daughterc1hys.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD669 5508 bytes
SHA-256: aae7f77254e55db7cea97d7d5110b69d9109f53931620a12c189c3c33d8b6c1d
font_01_sfnt_off0000e901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE901 11040 bytes
SHA-256: 10ab715bff3033c41f2d5405299d6afd28e5fee78a03e44afc8095106cb477b1
font_02_sfnt_off00010ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED3 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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