Malicious PDF — malware analysis report

Static analysis result for SHA-256 63be7b5331ceeb3a…

MALICIOUS

PDF

73.3 KB Created: 2021-06-09 04:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2e7a788258f52efaf5713c5f1cad4649 SHA-1: 21c06e94c4393a973b86cce69db721bb2da6f021 SHA-256: 63be7b5331ceeb3a95e568e52d0adcd240254b94f1813848832a19c4181631d2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://huntic.ru/pbw?utm_term=football+plus+apk+firestick PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450430/normal_6008ee9fedc61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459478/normal_6036db37b94af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406516/normal_604cc2aa653ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://metudebebi.pbworks.com/w/file/fetch/144646026/sadifawudojowexobozazigu.pdfIn PDF document text
    • http://gemometis.pbworks.com/w/file/fetch/144904332/letapubowiti.pdfIn PDF document text
    • http://sujagajo.pbworks.com/f/pajorilizunutixegavixik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/732167a3-7fa7-4202-98e9-ea472eb02689/wunuzuxomumu.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/707861912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/361d5331-f026-4bdb-aa63-4304b16fa317/kejarajanelujibexofox.pdfIn PDF document text
    • http://disisopaz.pbworks.com/w/file/fetch/144598476/hydrocarbons_class_11_notes_for_neet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e93f6e59-be4f-4d8d-a649-29107ed88c56/kabemiwogolad.pdfIn PDF document text
    • http://gijorugisaw.pbworks.com/f/tp_link_access_point_setup_static_ip.pdfIn PDF document text
    • http://fufitiruw.pbworks.com/f/soundcore_headphones_how_to_pair.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/harry_potter_and_the_cursed_child_film_adaptation.pdfIn PDF document text
    • http://wusajigi.pbworks.com/f/damodizemin.pdfIn PDF document text
    • http://poguvovuk.pbworks.com/f/how_to_use_ion_keratin_smoothing_treatment_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8f90105-1826-466d-9073-cf917045ed3a/botot.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_off0000e038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE038 5168 bytes
SHA-256: 43e4360a3c63e7356fef19c1e8efc9138450f946047fa9942b8927061ff5a50b
font_01_sfnt_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 11304 bytes
SHA-256: b869d9f586ba864b5e8f7051e281e2077e9f40e1be19d20ee007e4d32ff2c983

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