Malicious PDF — malware analysis report

Static analysis result for SHA-256 460586c67193ae3a…

MALICIOUS

PDF

72.7 KB Created: 2021-03-04 18:30:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1937a61947c0d12ad79067e6c159e263 SHA-1: 15f398abb384a7e1f81d8c0b841d8af746301a68 SHA-256: 460586c67193ae3a25887bf9ab20e7302300839e408fa55a1821cc7bb2a959df
66 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, many pointing to disposable domains, and is flagged by a machine learning classifier as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using small PDFs as link farms on disposable hosting, often a tactic for phishing or malware distribution. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://mezovuduw.ru/strik?utm_term=creswell+2008+research+design+pdf PDF link annotation
    • https://cdn.sqhk.co/wepiwojeta/hjUhg07/zarchiver_apk_download_ios.pdfIn PDF document text
    • http://sberbank.services/godului15c5.pdfIn PDF document text
    • http://latuha.com/549550316594wjda.pdfIn PDF document text
    • https://letazofuwukuge.weebly.com/uploads/1/3/4/8/134869061/kenemeboxuz_vopujo.pdfIn PDF document text
    • http://mnclassis.org/37085703805wmd7o.pdfIn PDF document text
    • http://nonretloli.site/evolution_of_corporate_social_responsibility_in_context_of_companies_in_indiagxvw2.pdfIn PDF document text
    • http://ig-copyrightnotice.com/dodipunagisivinumixeftcsi0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371005/normal_6002fb7ac539a.pdfIn PDF document text
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/9da5f16340d461c.pdfIn PDF document text
    • https://cdn.sqhk.co/mezugifosa/3XMjcge/bid_sniper_app_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/9HM6dhf/66483397700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417325/normal_6032e67a1741e.pdfIn PDF document text
    • https://gogalafubixuvu.weebly.com/uploads/1/3/4/6/134642314/3552881.pdfIn PDF document text
    • http://wotanute.22web.org/xavojafegutukisino.pdfIn PDF document text
    • https://cdn.sqhk.co/turaxulefa/3ghLNhl/zoxutowugufo.pdfIn PDF document text
    • https://rapelolizoxofi.weebly.com/uploads/1/3/1/3/131381924/zewuj.pdfIn PDF document text
    • https://sasominafa.weebly.com/uploads/1/3/4/3/134362810/79acaaea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mojilobopage.rf.gd/dating_online_scams_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/sawinaweximenizav.pdfIn PDF document text
    • http://kubuxakul.epizy.com/xurapaxitadulo.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/rifunirezozuwunadefaju.pdfIn PDF document text
    • http://mobuloremade.rf.gd/58808467702.pdfIn PDF document text
    • http://xenuduximowub.epizy.com/the_idiot_book_elif_review.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/molurazesodujedalumutu.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_off0000dd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD25 5880 bytes
SHA-256: 2e3e0437d6efb05dfa835c9398c072fa5ef88a4a308381a35f95c7b75d080db6
font_01_sfnt_off0000f137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF137 10484 bytes
SHA-256: 5b0669b6ac81c18d14c433cfcef53b46b7c93697dc9ec5764c9488cefb8c7138

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