Malicious PDF — malware analysis report

Static analysis result for SHA-256 5971b7ec931b2488…

MALICIOUS

PDF

72.4 KB Created: 2021-03-02 08:50:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c7f1502b2176ce4810c87e8a9f8302ec SHA-1: 9893c616d944ccd40ed1e4ebc2001ed62911fbfb SHA-256: 5971b7ec931b2488530c406ce2b7600946fbb94c1e7e50d9c7940b952390fa69
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, including one pointing to 'mezovuduw.ru' with a keyword suggesting a compromised game. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/wix?keyword=shop+empire+3+hacked PDF link annotation
    • https://wosaboler.weebly.com/uploads/1/3/4/4/134496590/07fa3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412388/normal_5ff114f66adaf.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/8ifxKAf/22284429265.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/hfTia2h/lemonade_recipe_fresh_lemons_simple_syrup.pdfIn PDF document text
    • http://debodopox.iblogger.org/vimapegi.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/ligukapefol.pdfIn PDF document text
    • https://beluxavin.weebly.com/uploads/1/3/4/5/134507718/ca94f444be06.pdfIn PDF document text
    • https://cdn.sqhk.co/sowanigog/az0hggh/76579561100.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxafopagad/idXvyar/39805088165.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467300/normal_5ffbef2b5e12e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xefejada.epizy.com/77537624845.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/66923703960.pdfIn PDF document text
    • http://tomuvonunilo.epizy.com/12507363373.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/catalogue_des_cameras_de_surveillance.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/ruwemo.pdfIn PDF document text
    • http://fabodatutowew.epizy.com/curious_questions_answers_about_our_oceans.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/tazapopetegon.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD33 5036 bytes
SHA-256: cd97254d28e85099f9953c454dd3da07a6f150a4cad23d526b46ab071dd84d79
font_01_sfnt_off0000de41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 12708 bytes
SHA-256: 4c3a328c75ebd0057aa0544c20e64f6392f0c6b07e5ba910ef55db92faf5d72b
font_02_sfnt_off0001066b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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