Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bbb8f33ca69a8de…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 05:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 024e85102112c89def1d5ea3fb46b17a SHA-1: 495a397d09fb0387c5191da785c9775292b7938a SHA-256: 2bbb8f33ca69a8de424ae063b3c8fe3fbf73ff7ad5bc7b620a7b643dbb4a7011
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to various domains, many of which are identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gedayapi.com/userfiles/file/tamojurozi.pdf In PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/zasatefa.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/11033092026.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/durivizapitibo.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/23462884016.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/47301940253.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/40588838669.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/siwuvolafomegitadijolexo.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/78256830927.pdfIn PDF document text
    • http://gzsjlt.cn/userfiles/file/muxon.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/24021620961.pdfIn PDF document text
    • http://korytnica.net/data/files/dubavanag.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/17862970917.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/94f329985c01f86b4bf5098a5ef36142/39949556027.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/54469257132.pdfIn PDF document text
    • http://bjjiffy.com/upload/37439743078.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/48879415886.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/21555254786.pdfIn PDF document text
    • http://willbramephotography.com/32965945606.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/27548655915.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/68197107523.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/zukiwoxave.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/11812294522.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/nibulotirivop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=terminal+emulator+android+imeiPDF 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_off0000d93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93B 16956 bytes
SHA-256: da550a9c28655209d6c35943551f6b700d189e88747c39c617d3238c589d3291
font_01_sfnt_off000105ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC3 10304 bytes
SHA-256: 8fa5cf6eb36d93aef0482d01fa0572d7140cf0096df998da50c5d29e60dbd258

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