Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed28c85ef7363a8…

MALICIOUS

PDF

68.3 KB Created: 2021-09-11 09:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 631a2bc6a6c020cf75c6ed614e9549f0 SHA-1: 09c011af1b4b187943b7c373893498e8324fe9db SHA-256: 2ed28c85ef7363a80f48d1f24e8b8b797d3fe63f06da3a91ae9bcfe2bfdf2644
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding a large number of URLs, many of which point to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://kiptep.ru/file/87978500442.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ad57015e---xaruv.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/wujafadubuxak.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/6543852653.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/zutupoxopifaxim.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/ruwerafanoxaxidesenuv.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/59751353395.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/vawuwik.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/sufezerolezelopup.pdfIn PDF document text
    • http://wixoon.hu/upload/file/83112214262.pdfIn PDF document text
    • http://twilaw.com/files/files/tazowexirejo.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/61643598861.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/lexejozapujepuperemopesav.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/6953224483.pdfIn PDF document text
    • http://esistore.be/userfiles/file/80891833901.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/88358250145.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/90773907615.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/kuwavolimekadapojukixogi.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/worinituvibisabelufewafu.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/92888261987.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/ziruw.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/87423276683.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/pogijuziwetejalosevure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cap+emoji+androidPDF 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_off0000b07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07C 10400 bytes
SHA-256: 2b0abe877784170dd991db50ded604335b138ec4f13751f06d771af6100bce84
font_01_sfnt_off0000c7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF5 14348 bytes
SHA-256: 9ae55b7023d30c27e590a03baab17af4e79c1141702c8a11db9e2b64901a7269