Malicious PDF — malware analysis report

Static analysis result for SHA-256 b412f09de9e22153…

MALICIOUS

PDF

77.7 KB Created: 2021-03-11 10:28:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9dde62a0d5bf968e314b0be10ab89bed SHA-1: 21d86ffeffc22a541f22e12d26de9ca61189c0e9 SHA-256: b412f09de9e22153aa976aad30c20f55fec938e3b52af3517860005804160340
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm with numerous external URLs. The heuristic PDF_SEO_LINK_FARM indicates a high volume of links, suggesting an attempt to distribute traffic to various potentially malicious sites. While no scripts were directly extracted, the presence of external links points towards an attack pattern involving redirection to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/award?keyword=brown+bear+brown+bear+pictures+pdf PDF link annotation
    • http://selizixid.iblogger.org/worksheets_for_beginning_esl_students.pdfIn PDF document text
    • http://italywow.pro/binadagaledetimebotuudihl.pdfIn PDF document text
    • http://edevletorg.com/1978_john_deere_316_service_manualidzwe.pdfIn PDF document text
    • http://fagutoje.22web.org/52015825223.pdfIn PDF document text
    • http://bitjoms.xyz/autel_maxiscan_ms300_obdii_scannerrxo8v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://talidarufuji.epizy.com/dijedujikuloleredobir.pdfIn PDF document text
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_0fe2cd509d24449e9c286cbd554065d7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/bible_study_topics_for_young_adults.pdfIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_a3c8e5dd43b44c0b98aaa35d5bf1d388.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitatotol/ionic_bonding_practice_problems_with_answers.pdfIn PDF document text
    • http://tepuvat.epizy.com/56276972557.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/veresetawagabujamim.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/dodavonen.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/xaxitipadalavog.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/how_to_put_a_scope_on_a_760_pumpmaster.pdfIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_d3232426ebe5461e88c20bf49c760add.pdf?index=trueIn PDF document text
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_a03328e394c34d41b77cba300ab14c79.pdf?index=trueIn PDF document text
    • http://bajitak.epizy.com/61357178550.pdfIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_7715ee61691c467cbf037942eca268b1.pdf?index=trueIn PDF document text
    • https://5b3500e9-40b4-440a-9ada-171ed8bcf4c9.filesusr.com/ugd/7820d0_9a1e04239bd849cb98bb3049f3f84ece.pdf?index=trueIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_56383900b2654dcb8f1432c438d9b30d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wolawatin/64857771513.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/57000939405.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_off0000f1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A3 5396 bytes
SHA-256: b2c4ae6558538f569e61c042a909d629e3f1d2b896a7ed8dda768b3373967839
font_01_sfnt_off0001041c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 10932 bytes
SHA-256: 77c184e59f0c8b4df5b7215e3ba478121e7babce9efa582d66169fb12189c626

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