Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf1985b52591210…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 00:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: dd8ddf4a83dc9cf72db388de486709c4 SHA-1: 7d92922528eb2f4edc29ebb8f3874ef88c94e260 SHA-256: cdf1985b525912108c519cf0189581cf692023c74fadfe98a518288cf3f89e8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, indicating a link farm designed to distribute malicious content or conduct phishing. The presence of external URIs and the 'link farm' heuristic strongly suggest the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://smidgel.ru/uplcv?utm_term=egg+inc+silo+permit+hack PDF link annotation
    • https://polaria.cz/images/file/xumixef.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7fab0a568---gojer.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/3905220848.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/81356084600.pdfIn PDF document text
    • http://micruts.org/userfiles/file/80108046741.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/rupefe.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109172302147179.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/21148928971.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/19214649912.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/mivipejimevipuziwilana.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/kijote.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/futafavogavekofuxene.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/pedov.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/33389354440.pdfIn PDF document text
    • http://elskenecologie.nl/files/20995029577.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/36380665240.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/24160981499.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/51930891275.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/b99dc31fe1b736986729a8dacb01618c/10547541540.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/bazikanarinupazusevubobe.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/zedazog.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/sarezobejaxadu.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_off0000b54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54A 14812 bytes
SHA-256: 5e210fcedd8ec710700b7ddc72f60723210432bc312eeb59089d8385ba7335a8
font_01_sfnt_off0000da58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 10896 bytes
SHA-256: c0d7ad2a0a73f148e2c83b11402d1a7fac8ced69ee993409cd6a9218a17bb500

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