Malicious PDF — malware analysis report

Static analysis result for SHA-256 675ee9435d86da7f…

MALICIOUS

PDF

77.2 KB Created: 2021-01-25 23:50:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3d0d32c50f909d0b61a629289424e0a4 SHA-1: a6ff094265446e58b77804deaaddf184fcc2d1c8 SHA-256: 675ee9435d86da7f700c4b3790fa1be7eaf0f931be9d53070fe81a4f3c848d27
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly subdomains, suggesting a link farm or SEO abuse tactic. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure flagged by heuristics like 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent, likely to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://leonvi.ru/123?utm_term=valley+ridge+elementary PDF link annotation
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/wexuliwonale-jizipekilu.pdfIn PDF document text
    • https://moxalabukeziro.weebly.com/uploads/1/3/4/7/134772199/digawasepozota.pdfIn PDF document text
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/lufujobok-gujuvamepaje-rosagebaxuzalav.pdfIn PDF document text
    • https://cdn.sqhk.co/bomunerafoju/hfjjZat/photo_video_maker_app_with_song_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/gjxBgdZ/40895392047.pdfIn PDF document text
    • http://bitsracing.net/adventure_maze_mornington_peninsulagcbal.pdfIn PDF document text
    • http://armada.technology/50254963409z9faa.pdfIn PDF document text
    • https://bexajaburise.weebly.com/uploads/1/3/5/3/135345802/1120917.pdfIn PDF document text
    • http://fresh-ita.space/jalinevojfx3os.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/cdIe2he/stick_ninja_flash_game.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/jolozidabi/bluestacks_app_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/94425737834.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/professional_development_plan_template_for_teachers_nsw.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/political_cartoon_analysis_andrew_jackson_answers.pdfIn PDF document text
    • http://topuwagib.epizy.com/road_construction_risk_assessment.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_off0000ebf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF2 5032 bytes
SHA-256: c3dab512bb75da983a271d112e2dd158929b2a04e3c5d21c02b6f417660db635
font_01_sfnt_off0000fd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD06 14892 bytes
SHA-256: c29cc66a9d4d6b1ee577d444e1917e7427260045dfeb4f780f66262c8edfb81e

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