Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b153b1ebaa43167…

MALICIOUS

PDF

81.1 KB Created: 2020-12-14 13:53:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 568869f74295d3a0a74782348c2855eb SHA-1: d4d64b97ff3afe68555d65a3ad1bd334dc3c1441 SHA-256: 7b153b1ebaa43167232bea5a0610c2d418b3d2e61d78fcf620657ea1f997ed76
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate the PDF is designed to link to a large number of external PDFs, suggesting a link farm or a method to obscure malicious destinations. While no scripts were explicitly extracted, the presence of malicious links and the ML classifier's high confidence score strongly suggest a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?utm_term=azteca+gary+jennings+resumen+pdf In PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/zobiketur.pdfIn PDF document text
    • https://sumudopijo.weebly.com/uploads/1/3/4/7/134716274/fezub-zapowasiveret-bosat.pdfIn PDF document text
    • https://bezijenogekise.weebly.com/uploads/1/3/4/8/134875893/xebuged.pdfIn PDF document text
    • https://sixonawujow.weebly.com/uploads/1/3/4/3/134369174/bb3f4eaf7.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/40ddfa4d7f4e3e.pdfIn PDF document text
    • https://fanamavikere.weebly.com/uploads/1/3/4/6/134610997/wafufevefenadori.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://static1.squarespace.com/static/5fc06cfc27a199023ab2e458/t/5fc11c55145a8629dcd87b6c/1606491221746/xetotepalozu.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/xupugevoxoduvifof.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4f0d68ef7301f8b2ad9db/t/5fcfcdcfb246a03091ee585f/1607454159628/download_telegram_x_for_windows_xp.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc27d2a9955c744b5459e15/t/5fd0d5e43364176a126655d0/1607521764949/navbar_rounded_corners_bootstrap.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3486312facd59cebc5192/t/5fc46946f81c9a2a0c2f863d/1606707528177/cognitive_psychology_exam_2_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/baburao_ki_comedy.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf16c9d7936484053ac33/1606283632985/solving_two_step_equations_and_inequalities_worksheet_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc58a53d49dd1244753c377/t/5fce8dce4f39131e41836334/1607372239270/26476757175.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dd9b8ef7301f8b108504/t/5fd1d8cafec2791e31087284/1607588043375/makujubenamukuxesafuvud.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_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 5432 bytes
SHA-256: 08b721f24a1499b4b1a25a8bb585c76869623679d1c5ef4dbbadaa4d38ced80f
font_01_sfnt_off0001046b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046B 11196 bytes
SHA-256: cb65d2cf1b8a3ace38ac0c6e13161fe9d64958fc74c84f0060d3bc7c61f0f541
font_02_sfnt_off000128f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F0 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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