Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e5416e807dadd6…

MALICIOUS

PDF

70.8 KB Created: 2021-04-05 00:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f00fdda29bdb38cebf0fd0ec51ec09ba SHA-1: 6fc19c2c4db72e7fa7db0adab3d2f72452ebe645 SHA-256: 15e5416e807dadd634fd89e0dacad2c6f92d8a03fd9e21a8b33f31442fd30241
134 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These links point to various PDF files hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the structure and numerous external URLs suggest the document is designed to lead users to potentially malicious content or for SEO purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/award?keyword=mathematics+diagnostic+assessment+pdf PDF link annotation
    • https://cdn.sqhk.co/retobumoki/Ahdheha/braiding_hair_salon_near_me.pdfIn PDF document text
    • http://setokanekema.mygamesonline.org/76216282145.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/icjhdjg/12553111886.pdfIn PDF document text
    • http://afterdealer.pro/83037621897a3e4n.pdfIn PDF document text
    • https://cdn.sqhk.co/sosexazefip/fpxmMut/toca_kitchen_2_mod_apk_home.pdfIn PDF document text
    • https://cdn.sqhk.co/zifixanuk/gheF6Yy/oxygen_concentrator_machine_10_liter.pdfIn PDF document text
    • http://ninomut.sportsontheweb.net/23257905412.pdfIn PDF document text
    • http://xanejog.medianewsonline.com/how_to_measure_ring_size_uk_h_samuel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379221/normal_5fd323b27d14a.pdfIn PDF document text
    • https://gegefajowib.weebly.com/uploads/1/3/1/3/131380265/mepexirewok_varefaram_loneguluw.pdfIn PDF document text
    • http://bred-enligne.com/xawefadewo8bqh3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415526/normal_60464b5d00a72.pdfIn PDF document text
    • https://cdn.sqhk.co/fakolafebu/jLJgdgh/70580712385.pdfIn PDF document text
    • https://dowolozudatu.weebly.com/uploads/1/3/4/0/134000293/xuzosojujonek-pavofazudogug-tamiw-nirijap.pdfIn PDF document text
    • https://taxedomarofagu.weebly.com/uploads/1/3/1/3/131378921/fiwuguzipewuva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456121/normal_5fc965e338c7f.pdfIn PDF document text
    • http://mpvideo.org/online_arbitrage_softwarec7v8m.pdfIn PDF document text
    • https://banepopewux.weebly.com/uploads/1/3/4/2/134234854/xarafos.pdfIn PDF document text
    • https://cdn.sqhk.co/dodirijobadi/j40ic5b/fikogipawed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dogiwexor.myartsonline.com/bunomuj.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_off0000d775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD775 5444 bytes
SHA-256: 4b807fb849b06086de703f00586b0516b97f89656a9b782d326828da11bfb36c
font_01_sfnt_off0000e9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EE 10636 bytes
SHA-256: 8a4ef28a7c6ac7faddec33631651ff99aaf41acf531a64aa393e06861af783aa

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