Malicious PDF — malware analysis report

Static analysis result for SHA-256 456dfb834d415288…

MALICIOUS

PDF

102.2 KB Created: 2021-03-12 08:40:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: fc38bba40820e6c8408ac5b440d76a70 SHA-1: f9ff96f9c8ea851ddafb26e31b3851401260e8dc SHA-256: 456dfb834d415288a14fae3134e2e73b653f5812fc0b22cc5c52090fcf1fdd47
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an external URI pointing to a suspicious domain, vilenefex.ru, which is likely used to host malicious content or phishing pages. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the presence of external links and the malware detection strongly suggest a phishing or malware delivery attempt.

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://vilenefex.ru/wix?keyword=staples+cashier+training+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454041/normal_5fd789f9710b3.pdfIn PDF document text
    • http://gujufifirisin.22web.org/solekapimozekurefaforedol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459785/normal_5ff0c0edc52e7.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/8hthgid/2219007331.pdfIn PDF document text
    • http://zahlungsservice-ch.site/family_feud_theme_song_remixuoxb6.pdfIn PDF document text
    • http://rulakegigarapo.22web.org/varavamaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405443/normal_5fd67354136ce.pdfIn PDF document text
    • https://cdn.sqhk.co/fodibaniwe/bjdvfih/fobamozozipevalakomuxupa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446633/normal_5fd3be757b5d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487197/normal_6023a880921e0.pdfIn PDF document text
    • http://vittorguxx.site/22254642971rzbjm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e76c657-801f-4b86-a6fe-097312d53482/28598710234.pdfIn PDF document text
    • http://xewaditina.epizy.com/marvel_schebler_tsx_33_carburetor_rebuild_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b97579a6-4b11-40fb-9ba1-fb7d718fcecc/world_leaders_quiz_questions_and_answers.pdfIn PDF document text
    • http://pepajefosub.epizy.com/bass_guitar_first_lesson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91c279c5-5f71-418e-8e96-c57474e3508a/kebigugomowifalus.pdfIn PDF document text
    • http://jijekoseme.epizy.com/74197628754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f45d5f30-514b-4f5e-8607-eec411a4e1e6/67799332401.pdfIn PDF document text
    • http://lulotekoxinemaz.epizy.com/14936922376.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15460 5388 bytes
SHA-256: 599f2fda2a23a7b4a2038d4293678cf2ba4b773efc858c04361ac9fe241a89b0
font_01_sfnt_off000166be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166BE 10944 bytes
SHA-256: ca80f38b5df74a8a1eda95283d7a9da4c4de3441b39896172f0619c4fb5b89e2

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