Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b1df736df0489e…

MALICIOUS

PDF

48.8 KB Created: 2021-03-22 03:36:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: bbafc9eafd4de45ae719e7d51f669521 SHA-1: e17316b9779745b2fbd9096a59a2c02228087147 SHA-256: 99b1df736df0489e2aa90ee1d39dca5a8b1a8aa46db8be59d23982f1ec0bada3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to phishing or malware sites. No scripts were extracted, but the PDF structure itself is indicative of a malicious SEO-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7155

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 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
  • 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://xajibur.ru/award?keyword=arbitration+act+1996+uk+pdf PDF link annotation
    • https://ratowoxure.weebly.com/uploads/1/3/4/5/134584599/30dcbc26687.pdfIn PDF document text
    • https://xavimunemu.weebly.com/uploads/1/3/2/8/132815343/6f3db0659.pdfIn PDF document text
    • https://wemavepudobug.weebly.com/uploads/1/3/4/1/134108610/14a0b605.pdfIn PDF document text
    • http://shtampshop.ru/krk_rokit_5_g4_eq_settingswlq37.pdfIn PDF document text
    • http://xafopawiki.medianewsonline.com/ssc_synonyms_and_antonyms_book.pdfIn PDF document text
    • http://tamogulaganero.scienceontheweb.net/asidosis_metabolik.pdfIn PDF document text
    • http://creditstar-kabinet.com/22303946046xibhf.pdfIn PDF document text
    • https://zuxadozi.weebly.com/uploads/1/3/4/6/134662888/putorisitir.pdfIn PDF document text
    • https://rowemuvirota.weebly.com/uploads/1/3/6/0/136089617/b4d556bd.pdfIn PDF document text
    • https://nakilogizo.weebly.com/uploads/1/3/4/3/134363069/numama-womomufuzokevob-xilunoni-saxagiwe.pdfIn PDF document text
    • https://mimuromujalu.weebly.com/uploads/1/3/0/7/130739347/39f474c9ada4acb.pdfIn PDF document text
    • https://tudodamoziw.weebly.com/uploads/1/3/1/8/131872054/mevusekadetowu-vexad-minimupaz-fumopemazebevu.pdfIn PDF document text
    • http://taroveruwidiba.onlinewebshop.net/attestation_employeur_pour_pole_emploi.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/sustainability_report_template.pdfIn PDF document text
    • http://movuzawizigevej.myartsonline.com/how_to_remove_bookmarks_from_old_computer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5d14cf4-8894-4383-a704-f5fb00308f65/migodadatore.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/mous_limitless_3.0_iphone_11_case_review.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/pofis.pdfIn PDF document text
    • http://malejubu.myartsonline.com/gta_san_andreas_pc_game_cheats.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/goropezekolomisu.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/rigupukiforetonaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95434316-4333-485d-8879-9ba0dd201a3c/97276933610.pdfIn PDF document text

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