Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fed5c8f1fe12780…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 11:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89079b35847d7497cfbb61a648ff5077 SHA-1: a9a654e5f2e4ac7fb4d7110a70354d70e350ca3a SHA-256: 8fed5c8f1fe12780424b99b736d7034ec0b8098abb6230fa2f5f52ec52fd510e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://wastran.ru/uplcv?utm_term=lenguajes+de+programaci%C3%B3n+para+android PDF link annotation
    • https://rpaxis.net/userfiles/file/60003632755.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/91662982185.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/dijurigavoviwapipesen.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/forazekujesudubegiv.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/riwebajefanamijuzemu.pdfIn PDF document text
    • https://polandpools.com/contents/files/gotelukexurasexaritowe.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210907_4233AA216505015B.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79617743294.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/9383901509.pdfIn PDF document text
    • http://regmac.net/userfiles/files/delazoraxol.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613234f623ab3---59766811398.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/pibatofefopivinelo.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/6201601068.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/zusos.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/fikup.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/86972579238.pdfIn PDF document text
    • http://iccarrentals.com/files/file/90030633223.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/wesekuzuzi.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://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_off0000ce31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE648 11040 bytes
SHA-256: f663447bb401f5d255e753b2431a6b3164b4d99775ed36a13b513e3a5ea8b8f2
font_02_sfnt_off0000ff74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF74 18756 bytes
SHA-256: 87cab3928723c7e85d08336aa62131ed28005b72bc8297f67005a56d2c76f3c9

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