Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce2424da8550906…

MALICIOUS

PDF

78.1 KB Created: 2021-09-15 17:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ba9fabc265cbe95212aade8dc06569a3 SHA-1: 002c10c7cfdf5b08d9980d499e717baab98bd506 SHA-256: cce2424da8550906f53baba0d560f178251103b7948b19c6313f315c327229c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm with numerous disposable URLs, suggesting a phishing or malware distribution scheme. The PDF contains embedded URLs, and the document body is heavily obfuscated, preventing analysis of its specific content but reinforcing the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://virker-ikke.dk/files/19940019318.pdf In PDF document text
    • https://sanipacific.com/attachment/file/3631505680.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/aa3753e111cdf8f494c8214e99c88fd0/bizigikarizefesop.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/19843579516.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/99865200604.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/35530409418.pdfIn PDF document text
    • https://tsolisp.com/files/file/zenitanazojodowolipuzin.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/pejada.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/89048461652.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/kipeterewide.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/96885629468.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/fajezusaj.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210901001944.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/58066647723.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/19001471590.pdfIn PDF document text
    • http://landpas.pl/upload/file/wotafimofivibisu.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/gagibizid.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/2d159feef89d123a20bcdf371e999fe0/81268795768.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/54935416516.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210909022440.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109101800467846.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/begefuvunisosolav.pdfIn PDF document text
    • http://sieuthibds.net/images/files/87656641084.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/27028532622.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/43221254169.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/8261101713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=i+believe+marvin+sapp+lyricsPDF link annotation
    • 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_off0000ceee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE705 10588 bytes
SHA-256: 65efd21f9eb44b45ab2820b7f3a1753667d8952d2198e1c6ca3f7f07399d7c58
font_02_sfnt_off0000fef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF1 16840 bytes
SHA-256: df2c45a3f72a4f304534d376bc28340160203194dceb4b86c7ba23d69071fc28