Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6eb93393c342bd9…

MALICIOUS

PDF

81.5 KB Created: 2021-09-11 04:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9be00b072357d51576cc1884afebf3cd SHA-1: c69bf7913b35743b35f2bfaf6cbe61d44bdae128 SHA-256: b6eb93393c342bd90985854ab5a0c8af2e61e3affa19271473e387542de0c272
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=program+inregistrat+convorbiri+telefonice+android PDF link annotation
    • https://dianthusindustrial.com/resimler/files/64499092241.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wodojofujowovufododeri.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/rododaxunuzifogezaxakam.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210907144744.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/67511811877.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/53225005376.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/95476448393.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/muzuxinelif.pdfIn PDF document text
    • https://equimat-cheval.fr/file/21524259240.pdfIn PDF document text
    • https://macronew.com/upload/files/42096649466.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/575732621.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/35717376694.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/85941679755.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/87286926345.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/lugufexosarakix.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/32407091413.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/27228795378.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/22917379075.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/dofutopedoxadugim.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/pekupeleweguvomitet.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/38777738662.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9b298ead5---45926480645.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/somejovevun.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_off0000d427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 11024 bytes
SHA-256: 2384bfe4fb411f97d9b007886c6e5667c15867ccde8ac2c1feb7830627b95d44
font_02_sfnt_off000105b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B1 18776 bytes
SHA-256: 82297fef693fa65f313a99066395fac4a3f5f2127203379260d7b3fd39e46f1a

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