Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7af2be5029a9f3…

MALICIOUS

PDF

79.7 KB Created: 2021-09-09 12:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 398fb759278cd4804fe8a04ebbe99f2d SHA-1: 65081127a88258d798de0c1771e3ebe64f0df199 SHA-256: af7af2be5029a9f3e862929d130450231562949ee5f3c334ae65e227a466b0d6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=mobdro+on+ps4 PDF link annotation
    • http://bioaec.com/userfiles/files/kusawepoluparod.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/45270163679.pdfIn PDF document text
    • http://webbuilders.com/files/file/zidawi.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/repodo.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/demewilitojivelubo.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/tovegoga.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/difetarekago.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/lerufit.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/soxegakineb.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/20952210791.pdfIn PDF document text
    • https://cet.sk/res/file/23390627615.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/11816253746.pdfIn PDF document text
    • http://getdol.com/page_data/file/ninujoforufabode.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/60454522336.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/digiremibavoz.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/zagamo.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/89753634164.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/40506342124.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/57940004070.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/nanob.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/667311895.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_off0000d4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BE 18312 bytes
SHA-256: cd26b5d804b4b8f7748f3e134a28ef82d5be4d6288ed027babcacd063a3be48a
font_01_sfnt_off00010397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10397 10064 bytes
SHA-256: 174b074e3774685a20487241cb0eb2c06b059b8abfbc4967dddff68f1ce76d8e
font_02_sfnt_off000119da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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