Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8500cfad66f916a…

MALICIOUS

PDF

78.9 KB Created: 2021-10-10 20:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fc646003ec78a07bbe835571975f55c6 SHA-1: 41477d64c39af7c045ecbb2f4497085db2015148 SHA-256: b8500cfad66f916a15f34fef15dc729486e5e5806c84c51a61f3206b95656c2f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to disposable domains and are likely part of a link farm. Heuristics indicate this is a phishing-related PDF, and ClamAV detection confirms its malicious nature. The presence of external URIs suggests an attempt to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6048

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://nomylo.ru/uplcv?utm_term=limousine+and+chauffeur PDF link annotation
    • http://wxeina.com/userfiles/files/xixebafujo.pdfIn PDF document text
    • http://elpijisystem.com/file/bewetujimox.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/witaneritameloba.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/74811769449.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/pofubewuzu.pdfIn PDF document text
    • http://bresky.cz/res/file/77802916133.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/13109551343.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/63611218550.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ps3t9h0uhsufnst90b8k63lv97/30861638533.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/rulozawijibomuper.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/nokazijekugekuximebuvoror.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/37273312018.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/kibizujikoti.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/49084363818.pdfIn PDF document text
    • https://businesslife.com/content/file/22033658562.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/8112886125.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/wataroledalegefa.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/80254372199.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/dujawomowezefijen.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/buvoxeke.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/32494399847.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/jemedazud.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_off0000dd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 19308 bytes
SHA-256: ff162b5a441f7466c50a0ff6d0fcfd08872ae108220cb9d05776df2e8647d01e
font_02_sfnt_off00012889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12889 10656 bytes
SHA-256: 49b1e3cb58ecab354656bb41666b8508b03607fff703a8858f9ef108d6e36b80

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