Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca913003b379d7d…

MALICIOUS

PDF

71.8 KB Created: 2020-12-16 23:42:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a64bc0532797cf683c3c25ff9a780cf0 SHA-1: 9e81e8e80b0e4bba60679dcccc96b5ed4c264f1d SHA-256: bca913003b379d7d741d926f49c971270ec8c9013231d3bf5b0dcdf9da09af51
156 Risk Score

Malware Insights

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

The PDF file contains embedded links, with one specifically pointing to 'trafffe.ru', suggesting a phishing or SEO spam campaign. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, further supporting this. ClamAV and ML classifiers also flagged the file as malicious, specifically as a phishing trojan.

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 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.
  • 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://trafffe.ru/123?utm_term=the+tempest+character+analysis+prospero PDF link annotation
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/zafabofuxidomawagine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413108/normal_5fa2abe1cf65b.pdfIn PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/4589730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426815/normal_5f9f30b201182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370529/normal_5fb9e48cb9e11.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0e6b83dfdd95b60d5131d/t/5fc0f20a9b1ed03538fd91f8/1606480395281/brummana_high_school_jobs.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc01ccfc14dfd36feed28e9/t/5fc3bf422dd96f5918603fc3/1606664003248/plex_pass_free_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ba6139e-0bc9-422b-ac09-d0a30dcf5e62/jiwovudozeb.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10afc403f5353fd968892/t/5fc2822a08845d0924db43ce/1606582828221/xuwogugijivol.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/nutrition_facts_of_monster_energy_drink.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc00c29085bf90c0ef85582/t/5fc273f661e25426e18713e9/1606579190812/82934694967.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5d7c15e8e827d42afc458/t/5fca68b0c50fa636063d9522/1607100593231/car_mechanic_simulator_xbox_one_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/switched_at_birth_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27d2688b-d928-45c4-9c7e-84fe2d471247/the_art_of_procrastination_a_guide_to_effective_dawdling_lollygagging_and_postponing.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_off0000dbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB0 5224 bytes
SHA-256: 667476279842f805854546c8515cba45a1e492383d09a06354a02f34101e6493
font_01_sfnt_off0000ed50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 11040 bytes
SHA-256: 3cc333923663eb2d6c72bf47bdad6598437df6c0c13774680e28f363a2da20d7

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