Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ade385231cdac0…

MALICIOUS

PDF

78.1 KB Created: 2021-02-26 14:25:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e332291ecab42e0a16106189d17cfb9c SHA-1: 4de3adafdcdc41dac8700af047cb96c45f2cb371 SHA-256: c6ade385231cdac09a13e0da69a6a13272871592d14636cfadcbcc2a8ef8ee47
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of seemingly benign ones. The presence of external URIs suggests an attempt to redirect the user to potentially malicious content.

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://bologen.ru/award?keyword=matthew+hussey+camila+cabello PDF link annotation
    • https://vidufatow.weebly.com/uploads/1/3/1/4/131438098/tigarazoguwopixez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479451/normal_5fe53b0c1f423.pdfIn PDF document text
    • https://sujanumijixedi.weebly.com/uploads/1/3/4/5/134501714/7a53306a6ec.pdfIn PDF document text
    • http://zewidixoxub.iblogger.org/venuvikekerit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383695/normal_601cfdc65bb26.pdfIn PDF document text
    • https://wemogutidagumov.weebly.com/uploads/1/3/4/6/134669151/nabunugarogobugag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464539/normal_602ee4702d6ce.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/fXxqjg8/27287120386.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484358/normal_5fee632387067.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://refawolasuwibi.epizy.com/definition_of_corollary_information.pdfIn PDF document text
    • http://pakimafagi.epizy.com/62818378494.pdfIn PDF document text
    • http://gatokelemek.rf.gd/baseball_star_mod_apk_unlimited_everything.pdfIn PDF document text
    • http://zunuwovadete.epizy.com/87133479940.pdfIn PDF document text
    • http://tesunujazo.epizy.com/3127673194.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/banner_life_insurance_beneficiary_form.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/blackpink_boombayah_album.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/38748953010.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_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 5280 bytes
SHA-256: b04bf6c1059781ca9ce0575a0d68bfec73bfdc461773f0642bb2974c13aa1048
font_01_sfnt_off000107e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 10304 bytes
SHA-256: 2032fe99bcc4503491e1dfcaafe923f9c8c3afde466b066820e08fc484142f0c

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