Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94b2eb571920509…

MALICIOUS

PDF

95.3 KB Created: 2021-02-16 19:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0831401d3fc926069865fb98e78ee64d SHA-1: 2d45450c7a664f55cdf3b6c5552becb136b0c567 SHA-256: c94b2eb57192050929f724a8c8a4a7123b73b5cc763403a4ebb4cc74abbe7c2f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting services, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and the presence of 'utm_term' parameters suggests tracking or redirection. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://maypoin.ru/123?utm_term=japanese+story+books+pdf+free+download PDF link annotation
    • https://zajanitemamivow.weebly.com/uploads/1/3/2/3/132303208/luwovekiviwut.pdfIn PDF document text
    • https://davixugamewa.weebly.com/uploads/1/3/5/3/135334906/gatajetu_sikonupomepudu_gokakupoj_tuboz.pdfIn PDF document text
    • https://lagizipat.weebly.com/uploads/1/3/2/6/132681030/nabitadesojen.pdfIn PDF document text
    • https://pepigapipewoma.weebly.com/uploads/1/3/4/0/134000130/naropulup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503987/normal_5feb9c393b2ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494677/normal_5fc900af3d695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469631/normal_5fe992b5b059f.pdfIn PDF document text
    • https://cdn.sqhk.co/gutipefu/3hfuKtJ/ducati_v4_engine_sound.pdfIn PDF document text
    • https://cdn.sqhk.co/xamowizaso/jJHd3hg/habit_tracker_to_do_list.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/daraniwekamidir/schwerbehindertenausweis_antrag_nrw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 24648 bytes
SHA-256: 6300a950d5dbef86ea007f9aa5b577dbb81bcbc47b34a966f130470934132c47
font_01_sfnt_off00013909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13909 5420 bytes
SHA-256: 50fb85bd9c5ff862ab1c33153e39d3a1dab8b1570ed484cd7517337eda6976af
font_02_sfnt_off00014b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B9C 10144 bytes
SHA-256: d28b160f75e40dab3df491981f5b6aee31b41bd1126052f233a0fd5351e9c124

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