Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1fd0bfafaac080…

MALICIOUS

PDF

71.0 KB Created: 2021-02-15 13:19:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: eded56a83fb3fc54eadddaec1e2b3033 SHA-1: 97406eefac0a1076553309187e9371ed86587bdd SHA-256: cd1fd0bfafaac080d613837cd1d55221f24f55d5ed9e8a5c1c96d268a9647a45
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/123?utm_term=fedex+cdl+jobs+near+me PDF link annotation
    • http://dujadesixozubi.22web.org/chemistry_2._3_elements_and_compounds_answers.pdfIn PDF document text
    • http://katerevemoposab.iblogger.org/25382015282.pdfIn PDF document text
    • http://kernig.pro/1529215656561ccf.pdfIn PDF document text
    • http://topstop.site/mubozowagukerodatoxorale7geim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xizesewidepo.epizy.com/32299644247.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/beyblade_v_force_mod_apk.pdfIn PDF document text
    • http://tinozireru.epizy.com/benugedenepezibonijino.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/82004256441.pdfIn PDF document text
    • http://webekilijonelew.epizy.com/depaxur.pdfIn PDF document text
    • http://sulumasofip.epizy.com/hollywood_reporter_roundtable_actresses_2018.pdfIn PDF document text
    • http://xizesewidepo.epizy.com/define_bovine_spongiform_encephalopathy.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/lobugazuvokotigokozak.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/student_exploration_circuits_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/jefetazoxin.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/bts_mikrokosmos_song_ilkpop.pdfIn PDF document text
    • http://pudekixepubaz.epizy.com/39078704834.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_off0000d804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 5324 bytes
SHA-256: 3e4453378acf5e32d80193923fb74451aff45e0c1f80a06f9a4c4d4cb584deb6
font_01_sfnt_off0000ea10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 10816 bytes
SHA-256: d3f5ebaa7bc7e9f2a510cee5a1b2d36c9034579e8fad10967f1bbaaca6be0cbe

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