Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a2e0204866c450…

MALICIOUS

PDF

81.9 KB Created: 2021-09-24 07:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c445d069a304e8375d5496be7d2c6f6b SHA-1: 3140ea1b775866c7a0f24989864aa3e8010eb22b SHA-256: 37a2e0204866c4509f844c4420df7a407451e99bd35b85a51f80d9364d441b26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is structured as a link farm, suggesting it's designed to redirect users to potentially malicious websites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or host multiple phishing lures. No scripts were extracted, but the overall structure points to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=diskdigger+pro+download+apk PDF link annotation
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/gixusuxumomapazibogoma.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/tawenadobivemasewejuvus.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/sizidifimefenibowen.pdfIn PDF document text
    • https://bem-sa.com/img/file/xuwijive.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/24457390105.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/702577856.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/40528164594.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/baxakewonotibumepa.pdfIn PDF document text
    • http://sinostandards.net/upload/files/ziralenumikebagorinitekiw.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/kewavi.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161365ddf3c06f---lasatevada.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210906124811.pdfIn PDF document text
    • http://goldmustang.ru/files/files/tamepe.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/70798888645.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137c5a6eb9d2---gozefuvabisototut.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/pugagifajakem.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/33755392951.pdfIn PDF document text
    • http://ndfeef.com/radiant/mechimobiles/userfiles/files/18093201201.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/mobifaxevesopekina.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/13929500974.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/rijuvevawosagerazan.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/37856373423.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/vubadevewesigi.pdfIn PDF document text
    • https://reniuved.it/file/popizixiliravejasopege.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/4278791839.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_off0000dbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F3 17532 bytes
SHA-256: 74b5658b33f49415c30268168e29f58d4f883fa3d34621c8dc8f4793f6158f82
font_02_sfnt_off000121a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A0 10648 bytes
SHA-256: e0821fc730d1a62926cd3f17bd8661ba716dc5bae72da01083d72139641af98d