Malicious PDF — malware analysis report

Static analysis result for SHA-256 3261131c2444325e…

MALICIOUS

PDF

86.1 KB Created: 2021-09-11 22:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 573bbf23bc18d7ab8d539154a612c6b6 SHA-1: 46f673e9ec2220059aa139c597e8cf616ad77bbf SHA-256: 3261131c2444325ecba894d0a4b5f194653beed269bf9d9fa637e84409a8a5d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=power+of+subconscious+mind+download+pdf PDF link annotation
    • http://bisnismedsos.com/userfiles/file/belofozinemizedexopit.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161383fe78536e---fifolomalu.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/4128689013.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/51097440790.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/lopunefoxudefifo.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/kegoxos.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/nerevakokowaju.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/11123316603.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/4059997535.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/nemudupudozi.pdfIn PDF document text
    • https://everestart.com/images/stories/file/bobitem.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/39473124375.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/nujiposesewanoz.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/29037228437.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/42496569127.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/lofegir.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/46399348139.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/mikugefonukenefo.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/sapopukamesijedupifeguzid.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/10474903548.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/16339421698.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/mesujofexevud.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210905050013.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/jijevepowenuwebo.pdfIn PDF document text
    • http://elskenecologie.nl/files/fanixud.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_off0000e659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 11008 bytes
SHA-256: 40e01721799547d54079cff7425b3c142b9acd7cf08927bb53e6b5c47bd6355b
font_01_sfnt_off0000ffc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC8 19496 bytes
SHA-256: a63a43b99381727d6773a79b522c29426f2af03695e256ce9140f89f8f93b291
font_02_sfnt_off00013258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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