Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f6c5bb9b92df8a…

MALICIOUS

PDF

72.4 KB Created: 2021-09-19 20:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f9acda4aee960b7026c3d5ef0f97af3 SHA-1: b9f4da361ad5b71a694c23f8269b20fe2fae524c SHA-256: 85f6c5bb9b92df8adb8788b05f8092ca0b1307462e275b5d8f9209ddda227ce7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://irlanc.ru/uplcv?utm_term=3+letter+words+with+i PDF link annotation
    • https://megashina24.ru/files/files/paroxaxaxuwilufitebidaw.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/paragi.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109162128224887.pdfIn PDF document text
    • http://vhshf.de/File/73766171923.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/wetelugozalitevafodunadav.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/furefuxuzoludojekowu.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/34119210414.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/satuxegevapexosipavuma.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/morub.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/gunefep.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/bopedirawulutupenob.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/64047133338.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/luzuvevisexuramu.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/32104765384.pdfIn PDF document text
    • http://ranczowdolinie.com/files/kodadisazanusebo.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/80483818954.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/77751607582.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/47525268167.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/63795787630.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/10859055898.pdfIn PDF document text
    • http://anpo.vn/upload/files/52504705698.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_off0000b8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E1 10240 bytes
SHA-256: e90482e762e331d9df522910144f1959255a64948e754ea177a7e934ee49b979
font_01_sfnt_off0000d011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 17108 bytes
SHA-256: c879672080af1428703065ab36b5dfbcedde1fd83d98b39b0bfc0b293ff11e1e

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