Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ecff665753788f0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 10:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bb95c46a593bb646b8bda4145a5b7b28 SHA-1: a66ca7232650c6609f361828451e181d14341518 SHA-256: 0ecff665753788f01ddb9581bfc0d82da43fbc065695354c735bec95eb03ed2d
134 Risk Score

Malware Insights

The PDF contains embedded JavaScript and is flagged as malicious by ML classifiers and ClamAV. It also exhibits characteristics of a link farm, with numerous external links pointing to other PDF files hosted on various domains. The primary purpose appears to be directing users to a network of potentially malicious or SEO-abused sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://m-styleauto.com/js/upload/files/53976630566.pdf In PDF document text
    • http://artio.pl/files/files/pugoxaj.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/wusabanemaxifovidipokam.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/98408461169.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/neralaxopovawefikebisuga.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/vibamotexut.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/xijazibujipepujipuzazowud.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/pozijela.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/sutojokug.pdfIn PDF document text
    • http://hanauhrova.cz/files/7874219858.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/xesetuwosuge.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/roruvijajigini.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/xotegadusuribiba.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/pekugaruwiridu.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/34812377304.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/nitazufipazomam.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/48948265817.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/tunemakodikegog.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/7128615628.pdfIn PDF document text
    • http://linza-market.ru/upload/files/80354346562.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/98026537285.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/45175142448.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/25006726994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=my+hero+academia+season+5+english+dub+freePDF link annotation
    • 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_off0000d758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD758 11304 bytes
SHA-256: 90ae821cff32b0f9f4ce9cbe6356855f100ba4814b69083179ffc6d6345ca814
font_01_sfnt_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A1 17864 bytes
SHA-256: b852c1d75e5f154afa13c2891a3a5d76e19841da8a7a5e04836e2afbf4892dd5

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