Malicious PDF — malware analysis report

Static analysis result for SHA-256 c604d9ad1b14eee7…

MALICIOUS

PDF

79.4 KB Created: 2021-04-02 19:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 65bffa5749138cc6cb85891868c94dd1 SHA-1: 61cc38a2e11d1a7cb86d49d253be11054e17f895 SHA-256: c604d9ad1b14eee70c73fc0180be024eb376fcdb82e6c225a47561f4689ba44d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are generated for SEO purposes, indicating a link farm or spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users to potentially harmful websites.

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://jacksth.ru/award?keyword=acuerdos+comerciales+de+mexico+pdf PDF link annotation
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/6e5ec9489b28d.pdfIn PDF document text
    • https://gepogixuzusesil.weebly.com/uploads/1/3/3/9/133999736/ba741315ca.pdfIn PDF document text
    • https://xaporavuxeboj.weebly.com/uploads/1/3/2/6/132695407/kagenaneke_bilunopib_bafomezes_zakexel.pdfIn PDF document text
    • https://kerimoseb.weebly.com/uploads/1/3/5/2/135299904/1247161.pdfIn PDF document text
    • https://poxovoxi.weebly.com/uploads/1/3/5/3/135398301/6999384.pdfIn PDF document text
    • https://poxedavuk.weebly.com/uploads/1/3/4/6/134608045/7600a4f5b6c.pdfIn PDF document text
    • https://wavasifowimuzog.weebly.com/uploads/1/3/5/3/135321241/foluzififo_wober.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/ps3_emulator_games_for_pc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/sacks_sentence_completion_test_interpretation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/wenivokavonutadukoli.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/acca_f9_past_papers_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/14253427576.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/82846065746.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/que_significa_cuando_un_anillo_de_oro_se_rompe.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/what_is_flowers_in_the_attic_rated.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/whatsapp_status_video_share_chat_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/fuvexawelunenatifekom.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/netbeans_8._1_oracle.pdfIn PDF document text
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_f409a714bfb8454cb5b94c608168ad23.pdf?index=trueIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_c9fd2128bd5048bbbc0bb408e962debb.pdf?index=trueIn 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_off0000f662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF662 5360 bytes
SHA-256: 93706c14d76b953ddbaf025869911a953cfd1cd6a2ad6e437b13f8911daf7bf8
font_01_sfnt_off00010887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 11768 bytes
SHA-256: c6f68bccdd88db9ea2d8f6aeedb0101b92762090e6ed637688d212e75117a412

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