Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca97f0ac5e8f5aed…

MALICIOUS

PDF

115.1 KB Created: 2021-04-27 09:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3afb0bbea54302496366c25b7840eead SHA-1: 737d6d083d6e55456705282fe9f0149c63eefa2f SHA-256: ca97f0ac5e8f5aed6e240296001081b205e62d8592f7acd0aae7a49ea14244cf
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/strik?utm_term=curso+de+primeros+auxilios+gratis+cdmx+2020 PDF link annotation
    • https://cdn.sqhk.co/lebexuzo/jeiaEja/singing_pumpkins_projection_dvd.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/drDjija/pawadugegogorozafalu.pdfIn PDF document text
    • https://cdn.sqhk.co/joduragenep/UKzsCOd/max_shooting_mod_apk_unlimited_stars.pdfIn PDF document text
    • https://cdn.sqhk.co/zufosupiz/idmlgfE/faraway_puzzle_escape_level_9_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/tiviluluje/ieFQcif/gacha_life_pictures_alpha_girl.pdfIn PDF document text
    • https://vubibawijov.weebly.com/uploads/1/3/0/7/130776162/6625511.pdfIn PDF document text
    • https://patoduwewoz.weebly.com/uploads/1/3/1/4/131483118/rukikiga.pdfIn PDF document text
    • https://cdn.sqhk.co/gobisofokox/bghEojg/ted_baker_dresses.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/6ihNNie/supolakefobiwobenetemumu.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/bibKPgh/55408891282.pdfIn PDF document text
    • https://lubikumak.weebly.com/uploads/1/3/1/4/131453733/9730528.pdfIn PDF document text
    • https://cdn.sqhk.co/sejixikerut/ageojgj/best_70s_and_80s_rock_songs_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/bevoletef/jbxTgeI/gebotuwijivasova.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_c40409d5826f4254ba89c1bf365b629d.pdf?index=trueIn PDF document text
    • https://619c993e-e215-4b07-891b-88776ecab8c8.filesusr.com/ugd/1fce43_eec4f555fd3e49e392fa43ff67e097d1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9078f629-6e27-41a8-9a58-8918cdf4c4fd/technivorm_moccamaster_kbg_741_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8435e61-fade-4956-b110-969f0b9890d8/maseru.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/gdpr_website_compliance_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/kitchenaid_stand_mixer_pasta_attachment_instructions.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_off000182b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182B4 5640 bytes
SHA-256: 8cdb851cbf6e64c8700e6c59ddd931cfe4d938250e38078dcdaaa33d9a1018f3
font_01_sfnt_off000195ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195CE 12040 bytes
SHA-256: 88dc50f1a6e6e581680d33f847c88fd735bbb110866faad75341fa1f21f66d1c