Malicious PDF — malware analysis report

Static analysis result for SHA-256 158f64f3b1459067…

MALICIOUS

PDF

70.6 KB Created: 2021-10-03 05:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 63ea076a5dbbc51264ac8e4f500774d9 SHA-1: 50c41c0ad0e9a8b4b1c518ad6224ede1bdc85dbf SHA-256: 158f64f3b1459067359aff8d467e23f2ecc803709882feb89bf03d1381b283c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to various domains, likely to obscure the final malicious destination. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145219694626---28711976944.pdf In PDF document text
    • http://ivelinabozilova.com/userfiles/file/zegan.pdfIn PDF document text
    • https://priscar.com/documents/files/mezanazipumij.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/26404576038.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/rekoma.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/34161329391.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/35260899882.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/76827297241.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210929142513_3pygv0.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/turikekeporuzaduforumefe.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/90507003449.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/71148385655.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/63438846759.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/nivigabagap.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/96831302099.pdfIn PDF document text
    • http://vps133.premo.at/userfiles/file/45277670831.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210909_9F167FD470961435.pdfIn PDF document text
    • http://isvpro.com/custom/files/11311878818.pdfIn PDF document text
    • https://fishboat.hr/files/sanixedaja.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/85899122947.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/gobagemitu.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/35221980465.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///89321982898.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/fegumekida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=most+3+pointers+made+in+a+gamePDF 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_off0000b1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E0 10856 bytes
SHA-256: 413e905f34a005dc108b76166923f799ca76f18bfc2c3763bda79a6afeb20462
font_01_sfnt_off0000caca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DC 16572 bytes
SHA-256: 96328c0341f07dc92ba436ac9a56c9bb035282b9d7f5098fe4e8795083daec62

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