Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31c6236797a8d2d…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 16:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 57f7fe1673731793507ba40de9d42e06 SHA-1: c7412533e1bec77cd2a35cb02ceeffcb988787a4 SHA-256: e31c6236797a8d2d0dfbf06a4a82cc62f2d9f671a6a19e6a6d8f1fd3d6cf325a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=george+orwell+1984+movie+online PDF link annotation
    • http://britishcytology.org.uk/ckfinder/userfiles/files/dejoxo.pdfIn PDF document text
    • https://mu3yc792xh-rl1.com/contents/files/41151614220.pdfIn PDF document text
    • http://aa-nusd.jp/56837906657.pdfIn PDF document text
    • https://polandpools.com/contents/files/gixufirejusekajez.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/sesuluge.pdfIn PDF document text
    • http://spaconsulting.pl/userfiles/file/zimiwutumamavifaroda.pdfIn PDF document text
    • http://odumakus.com/uploads/files/9007275162.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/bokubiko.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/26959709345.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/xukabot.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/80879869601.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/migawodefoloxizenori.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/goponi.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/vibadejedavutufe.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/rapugi.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/cbe99dccbfd4235598869503108ce525/wuxufenemamufufoxaguwal.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/52804627393.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/97433034376.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/wafovezogebubamakeromakos.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/buxakekusumim.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/zavimirulebukigaf.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/kopotil.pdfIn PDF document text
    • http://antracit.topmebli.com/content/xuploadimages/file/50537903422.pdfIn PDF document text
    • http://vhz.cz/user-files/betikopobokanavaxe.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_off0000af4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4C 10720 bytes
SHA-256: 91f327e376ecfe63d8294ff11010bb0fc63953313a094b553a5e17f745875a6a
font_01_sfnt_off0000c80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80B 16464 bytes
SHA-256: 277a51c1af591b0bbea4817251efe005f64adfcc0507b9cd1c4d09391ff570b4
font_02_sfnt_off0000f25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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