Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eca474778c3ff4f…

MALICIOUS

PDF

76.8 KB Created: 2021-03-06 18:30:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 25440e22c8b706a2a63c78184205e987 SHA-1: ab71bc694fa60c1c74d68765bef304ef427b8d5a SHA-256: 2eca474778c3ff4fe994dcfbbcc39bd79c7d48b247501d1ab195413d2afdc5db
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO poisoning attack. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, potentially for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://xajibur.ru/wix?keyword=com.koushikdutta.vysor+apk+download PDF link annotation
    • https://cdn.sqhk.co/pananumujo/biacmhi/draw_a_stickman_color_buddies.pdfIn PDF document text
    • https://vekewofamir.weebly.com/uploads/1/3/4/1/134131384/345df6233.pdfIn PDF document text
    • https://nitevafatuva.weebly.com/uploads/1/3/4/8/134872456/716234.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/nQhjGha/82763923852.pdfIn PDF document text
    • https://nowagomasililub.weebly.com/uploads/1/3/0/7/130775830/fudumudixel.pdfIn PDF document text
    • https://cdn.sqhk.co/visobipibe/Vhdia9w/don_t_rush_slow_touch_grind_on_white.pdfIn PDF document text
    • https://jexabuwojese.weebly.com/uploads/1/3/1/3/131384148/jilavifotubamamatoz.pdfIn PDF document text
    • https://cdn.sqhk.co/fexiseme/hiW9xWi/taziniwano.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4ddf61b7-1a4c-4bc2-bc1d-285595a2bee2/18857304888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b3119e-6503-40b4-bef8-a7441e22de85/95237310159.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d2989bf-d017-4f80-8082-1ebea027eb48/how_do_you_do_a_carriage_return_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d38f892-0961-43d1-917c-7bc70564bea7/papulinazopojodifuke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64e97368-68de-4e68-be34-382b4ce2cdb5/vusidukojoxezomepite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8be36911-2e4f-4c63-9589-2f5644c7fcb1/xumapupofuluzamefefub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/346201e1-cc3c-4dfa-b3d6-b985aa9c4ce0/is_there_a_sequel_to_nora_roberts_the_awakening.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef7d44f5-2af3-4b1c-94d7-83bdb3bdb761/how_to_use_dyson_hoover_attachments.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE215 5336 bytes
SHA-256: 6b3a6d0b1d3f86370e685f39f3c5c80b795ad8097c1aa857085bfa387382abe4
font_01_sfnt_off0000f430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 10472 bytes
SHA-256: f803126a9888c3db8411f7f96108838280c5684e94128e56efa125e8336c5cb1
font_02_sfnt_off00011807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11807 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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