Malicious PDF — malware analysis report

Static analysis result for SHA-256 97e2b459528669ee…

MALICIOUS

PDF

83.4 KB Created: 2021-09-11 15:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 046d60d56e125765895346419b3e7efe SHA-1: 186630e02293fe632b5e3177fe0eacc4231fb7c0 SHA-256: 97e2b459528669ee1396e0dbf94809377f45b4f491c48804b1d4e6979ab63a07
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, suggesting a link farm or content distribution network. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ruedi-leuthold.com/userfiles/files/diwewivut.pdf In PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/52807857594.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/baa3bf31cb4470b4a7d370107adcd3d2/jemot.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/misepuxexuwavidek.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109031212346753.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/bewijogixebozowipalifujos.pdfIn PDF document text
    • http://realestatemiami.com/userfiles/files/1714904045.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/fikelinepi.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/sujuzopotigu.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/kerejimaduk.pdfIn PDF document text
    • http://wenxuezj.com/images/File/zobuzudavisokovimufi.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/wotunapisaxobozileget.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/52195565940.pdfIn PDF document text
    • http://sbkf.org/files/files/53846828252.pdfIn PDF document text
    • https://felicityokolo.com/file/gutoba.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/51041003182.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/satiligujo.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/vimopowowitepa.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/wewotadelovifugiloresi.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/53001835848.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/dijoxigo.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/72910646611.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/65554778313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=my+talking+angela+hack+modPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10A 18064 bytes
SHA-256: 27e813b54d3f64732cd06de7e46fb66315bc5aca175e0bd494dc544bd11d473c
font_01_sfnt_off00010fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB5 10748 bytes
SHA-256: 6529b9691d139b0591f647ffb2a35318c7843896184bf51e8a7dba94bf8f2b73
font_02_sfnt_off000127fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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