Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d87c6d04ac3b0ce…

MALICIOUS

PDF

68.2 KB Created: 2021-02-16 22:19:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e74084c44eb3d37660b6d67654196666 SHA-1: db796c7d28ae4337f6e1cbc24fe9f4455c5f31ba SHA-256: 9d87c6d04ac3b0ce427278d27eba84187b3901d67200ec46f734cc3ab5c3b39d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' designed for SEO spam. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

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://leonvi.ru/123?utm_term=pe+exam+dates+florida PDF link annotation
    • http://debegezuvume.iblogger.org/bose_acoustimass_15_cord.pdfIn PDF document text
    • http://ruseseru.iblogger.org/ezel_music_piano_sheet.pdfIn PDF document text
    • https://dopapebo.weebly.com/uploads/1/3/4/8/134870178/09497ca67.pdfIn PDF document text
    • http://bugelojuta.iblogger.org/what_is_sociocultural_learning_theory.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/mamibis/christmas_carols_songs.pdfIn PDF document text
    • http://vidabovon.epizy.com/40528734153.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/soil_aggregate_formation_is_facilitated_by.pdfIn PDF document text
    • http://bususetut.epizy.com/73244650955.pdfIn PDF document text
    • http://zuxamivim.epizy.com/vumuwawesoxa.pdfIn PDF document text
    • http://nufufud.epizy.com/osrs_supercompost_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/53102819973.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/99820969729.pdfIn PDF document text
    • http://nakapuzukatojog.rf.gd/49033412408.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_off0000cd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD85 5124 bytes
SHA-256: 0452a37275497fadc8c69330995b9dd2130377925caf49878b18ae5cc89aa831
font_01_sfnt_off0000dee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE0 10584 bytes
SHA-256: b84eefc2bb902452f32542bfdfda9dc487722e1400f75567cc7772d52e49198d

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