Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36642155abd80e4…

MALICIOUS

PDF

77.4 KB Created: 2021-06-02 15:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 938116168d90772c10c8377f8fc3a6fa SHA-1: b3b4f2d94ce50ad2cb4963a254cd87697dd595a8 SHA-256: a36642155abd80e4389f9c689616f9023114e6d11e49c07cbdf660a1982909f6
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://medvor.ru/pbw?utm_term=rita+pmp+book+10th+edition+pdf+free+download PDF link annotation
    • https://detidigem.weebly.com/uploads/1/3/4/4/134491675/mibivafakode-fugawomi-najofo-puwivo.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4496811/normal_60b1c9ce640d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408176/normal_5fca8e98abc81.pdfIn PDF document text
    • https://jaluvipuruwagub.weebly.com/uploads/1/3/4/7/134734890/sevuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382948/normal_602816dd98b64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413838/normal_5fdd39b0b2367.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413125/normal_60007456b4db4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_606d13493f1e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382974/normal_602683f31eb95.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4489245/normal_60b207ff20e83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tujelupirobe.pbworks.com/w/file/fetch/144494334/can_i_use_amazon_alexa_as_a_speaker.pdfIn PDF document text
    • http://kinuwibe.pbworks.com/w/file/fetch/144444603/backstroke_full_movie.pdfIn PDF document text
    • http://wixugigir.pbworks.com/w/file/fetch/144438492/class_11_chemistry_empirical_formula_questions.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/w/file/fetch/144500259/samsung_xpress_m2835dw_imaging_unit_reset.pdfIn PDF document text
    • http://wuwazilizos.pbworks.com/f/pogelipajat.pdfIn PDF document text
    • http://zogekinovag.pbworks.com/f/web_design_tutorial_for_beginners.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/f/where_to_take_cars_for_simeon_gta_online.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_off0000eca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA0 5600 bytes
SHA-256: d7c01ef0af35ada574ea260f75ed401e9798126766cb9686e027b5db2fafc82a
font_01_sfnt_off0000ff9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9A 11400 bytes
SHA-256: 4ec4134edaf8268747ec7cb82273e6dad7e1a4039ed653704710da92f7639629