Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b29b111fe195c1…

MALICIOUS

PDF

65.1 KB Created: 2021-09-29 05:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: eb67aa9e99a5aadf757ecfd3bddb9247 SHA-1: a77cdd7a0dce6b4a3b756af9c82a2baa1e38d014 SHA-256: c7b29b111fe195c1be8d4784329c8c25126d086af08d457d2302c2de2e4bd775
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7503

Heuristics 4

  • 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
  • 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=hide+pics+and+videos+app PDF link annotation
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8fb353f8---96145510216.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/mumumugokuvite.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/zusekiweralegofemen.pdfIn PDF document text
    • http://rcot.by/pics/files/tarukoximotebikafubesumi.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/74886048353.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/28747218332.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/43409582512.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/16604042140.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/jobedalizamutojixivovegog.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/33129339836.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/xonovisapexobubijine.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/dotukisikepale.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/98602545508.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/valafakupubejorolofuxafu.pdfIn PDF document text
    • https://forumsevens.com/images/file/kuzes.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/77777386583.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091714115173499.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/vitinifigokuvebe.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/75236031419.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/62641083683.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/fevumovimej.pdfIn 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_off0000ade1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE1 16420 bytes
SHA-256: 882c0a2a690380649afb61ee7ae9c9fd43bef45c223bec0d8712b1f1aa387cc7
font_01_sfnt_off0000d732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD732 10320 bytes
SHA-256: 4431ab2a6c69221cd0345e3ec31fbc0de6e0b6d786310acc128e1a2355f3cbde
font_02_sfnt_off0000ee8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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