Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8bc139011d7cdf…

MALICIOUS

PDF

76.8 KB Created: 2021-04-06 13:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cddad9f18c20e0bd17a6be15ae679ef8 SHA-1: b9dd66b9d867929d96a18f6dc3ec1a7408bbcf4c SHA-256: cf8bc139011d7cdf5ed3c5866e6387959dbafdbc933a5d4796fd1e6ecb706039
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a book title, suggesting a phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/123?utm_term=adam+bochenek+anatomia+cz%25C5%2582owieka+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457560/normal_5ff8dacaba63c.pdfIn PDF document text
    • http://vashobereg.com/how_to_deal_with_identity_theft_ukeg92o.pdfIn PDF document text
    • https://fowuwulavo.weebly.com/uploads/1/3/4/7/134754099/463d3948246b46.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/which_philips_wake_up_light.pdfIn PDF document text
    • http://vonezejavej.22web.org/properties_of_alkenes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404757/normal_602d697c0e3bc.pdfIn PDF document text
    • https://nupuwuzom.weebly.com/uploads/1/3/1/4/131438231/1519906d5.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/koliform_tinja_adalahuwemq.pdfIn PDF document text
    • http://leoidet.xyz/skilsaw_circular_saw_blade_replacement78vqd.pdfIn PDF document text
    • https://sulomotosepotu.weebly.com/uploads/1/3/4/7/134744650/8108798.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369486/normal_5fef52db622d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_6034dd255d9b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409095/normal_602896fa16774.pdfIn PDF document text
    • https://gilulunerokife.weebly.com/uploads/1/3/5/2/135296548/sedegexujivu.pdfIn PDF document text
    • http://siviveko.getenjoyment.net/59657642988.pdfIn PDF document text
    • http://vadusulu.iblogger.org/vapubukojejujawadonifi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390328/normal_606504150629c.pdfIn PDF document text
    • http://power-guard.shop/temel_karakalem_derslerietkw3.pdfIn PDF document text
    • http://pabukelib.66ghz.com/maths_textbook_for_class_11.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gikunipif.epizy.com/hongos_en_la_industria_alimentaria.pdfIn PDF document text
    • http://mukokulag.epizy.com/90342575365.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_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 5480 bytes
SHA-256: cf816f98c12edb72c0fcfb4b976a1c443bfda2b48dbb3dac6e305486c203e3e1
font_01_sfnt_off0000fd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 12648 bytes
SHA-256: 4f5c6e07b2fb6badd0e0a875c17d4e72e59a2229c00a295682e2cf091831f98f

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