Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c4ecb82add7eb7…

MALICIOUS

PDF

73.1 KB Created: 2021-09-17 21:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90a8abff1323654c005b15c179bdffde SHA-1: c163da114f164279ff211edfdb855b9f74a3aaca SHA-256: 81c4ecb82add7eb7791f1c264a6bbb5809a9d975ab345cf2d9824271aaaef6fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to numerous disposable domains, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=electric+man+2+two+player+games PDF link annotation
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/3afca9e73ddcccd168c900d4d334da8c/37877852904.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/winepijebapulitubevoma.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/zegazifawukixapurujikaz.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/mujibanojupov.pdfIn PDF document text
    • http://ailizia.com/userfiles/60287153.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/53721319534.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/pojigisunuxurul.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/jitataxopaxupetakogabi.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/dajudaj.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/81137449225.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/c7d30e0b3c4c02c4be597ffc51e9cd98/96040598803.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/dopobitepiwimaxif.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/55451262229.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/rodapojijamipafetodivo.pdfIn PDF document text
    • http://opersan.com/file/lilosekigegif.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/4112907788.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/39460936254.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/lamogoxotu.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/razovilejotoziviteta.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/xikanarap.pdfIn PDF document text
    • http://haki.vn/uploads/files/67597231343.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/50863269580.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/23907496394.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/86758127304.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_off0000ba33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA33 16776 bytes
SHA-256: 792857f5b6649a72e037c335342399161726aee0730b7e0b11fdd60ed57ba1a9
font_01_sfnt_off0000e56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 11020 bytes
SHA-256: cf413aaca11a458c9070241a5febec4b5ab4cdcf82aa93e04b7ead0e438e57a8

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