Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb3d58ddf82545a…

MALICIOUS

PDF

74.3 KB Created: 2021-03-03 11:22:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e79ee27214bf6cbab5e539914960ccf5 SHA-1: f8631d37777ce2ccb1273f0a19c4d2f3e34dd8d8 SHA-256: 8eb3d58ddf82545affd0cfe87f5b49e337a940ff0cacba0365363a453493f82e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple embedded URLs, with one prominent URL pointing to a site offering game cheats, suggesting a lure for malicious activity. Heuristics indicate the PDF is a link farm on disposable hosting, and ClamAV detection confirms it as a phishing trojan. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic strongly suggest an attempt to redirect users to a malicious site for payload delivery or credential harvesting.

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://kuzutuzo.ru/award?keyword=cheats+for+blood+bowl+2 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376875/normal_5fcb248c3fdaa.pdfIn PDF document text
    • http://chambre.xyz/emotional_intelligence_development_planweaja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498893/normal_600594bad9e37.pdfIn PDF document text
    • http://jokixulu.iblogger.org/ravaleguximoragusari.pdfIn PDF document text
    • http://sajitalunaded.22web.org/aaina_full_movie_video.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445331/normal_60281e16efe49.pdfIn PDF document text
    • http://interbankdigital.com/what_is_restful_web_services_stack_overflow9tfne.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478125/normal_6019d5e6cc721.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408711/normal_6009a14b03c11.pdfIn PDF document text
    • http://cloudmarket.website/apaharan_sabka_katega_cast_full_movie4sf8t.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/wupixufekijax/wejusokiguzasuzazan.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/how_do_i_write_a_letter_of_recommendation_for_a_college_student.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/kixobawazupamexobakegona.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/noun_verb_adjective_worksheet_4th_grade.pdfIn PDF document text
    • http://jawegoxizifiti.epizy.com/commutative_law_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/setufoboxosizakixojetako.pdfIn PDF document text
    • http://jenuvuzawo.epizy.com/80771434257.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/zuxenelemuronowoduzisusod.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_off0000e6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 5264 bytes
SHA-256: 987d46ce467aefcba47126fc467cf76717ede8986337cdc8d2689404ddeb1f96
font_01_sfnt_off0000f8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C1 10260 bytes
SHA-256: 6e5b2767233c07e7319e9971207a29e888e4337d2647bbb2dae9d3a3e59f9320

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