Malicious PDF — malware analysis report

Static analysis result for SHA-256 812ff21974995cbf…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 12:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: efd06cf462e5fd21edee4c788e902eeb SHA-1: 249ead1d73471a786c3d6f5d8182b1a3db18c305 SHA-256: 812ff21974995cbf9f8f01e66b5432b8674d85dc346fc1706ac8ab8ea20876a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

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://coretry.ru/uplcv?utm_term=how+to+change+power+button+function+in+android PDF link annotation
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/oah8r53etn9b0eaoj8apnmeek4/zafigebop.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/29971654003.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/584e6601f43c6afd2258487aa5458a41/galupagowetova.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/jusuzonejaganamodudamufoz.pdfIn PDF document text
    • https://invision.buzyhub.com/files/54060807813.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/rorebopizige.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/ruvebimibanevozuderas.pdfIn PDF document text
    • http://centronegozi.com/public/rumorunirejijerabosal.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/46608396487.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/12512722767.pdfIn PDF document text
    • http://grupophi.es/uploads/files/73638389592.pdfIn PDF document text
    • http://yejida.com/userfiles/file/23720421889.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/96486476928.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/1233812289.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/8034570193.pdfIn PDF document text
    • https://schmitz.cz/res/file/jupuzapeba.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/32759000184.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/82828424219.pdfIn PDF document text
    • https://chineseclothingonline.com/File/gubiviburutewumakisetok.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/busepizosewigu.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/34416055647.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/70490550709.pdfIn PDF document text
    • http://gespk.com/userfiles/file/35772244387.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/jaforinofolafinuzowur.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/kowexigibokuxiv.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_off0000e045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF857 19740 bytes
SHA-256: d46de94d368ac1b8d765cbc077d18c76e76f23828dc93c5605ead85e601b18c9
font_02_sfnt_off00012b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8B 11000 bytes
SHA-256: 2cadc32006e65186193fea5f39e53ac158c49c2d88e38feb82fcb0e936ebc6f9

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