Malicious PDF — malware analysis report

Static analysis result for SHA-256 1741ee52b1d4d501…

MALICIOUS

PDF

84.1 KB Created: 2021-03-14 22:32:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0646519ff1c3381e5783e3afad4cd36 SHA-1: ea2858bbabdf32202f6caed0ce775aa94cea5097 SHA-256: 1741ee52b1d4d50123118848bc39a1efe887741013e00d9e880c9e0949e709db
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URIs, with a primary external URI pointing to 'https://vilenefex.ru/123?utm_term=caesar+cipher+pdf'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of external links strongly implies an attempt to redirect the user to a malicious site.

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/123?utm_term=caesar+cipher+pdf
    • https://static.s123-cdn-static.com/uploads/4383147/normal_5fca4b5852974.pdf
    • https://static.s123-cdn-static.com/uploads/4476126/normal_6006305b3d933.pdf
    • https://cdn.sqhk.co/forinabam/TCygfJ4/download_farm_invasion_usa_mod_apk.pdf
    • http://gusevoxuzuwelap.mywebcommunity.org/1886912633.pdf
    • http://rawitotizoxuk.scienceontheweb.net/92047182780.pdf
    • https://cdn-cms.f-static.net/uploads/4446650/normal_6046607a822bc.pdf
    • http://lapitubemexidi.mywebcommunity.org/wepesoxudefaxigurabodoje.pdf
    • https://cdn.sqhk.co/dosojegomugu/Jgg3q7N/apk_wedding_cake_maker_games.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kapirexazi.onlinewebshop.net/wedotudarod.pdf
    • http://mujujum.epizy.com/3ds_emulator_windows_7.pdf
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_298c97c67a0345db9eda3310a69c7bd1.pdf?index=true
    • http://najexenij.onlinewebshop.net/fadesaga.pdf
    • http://jeneviwa.epizy.com/xegipuvinoxagi.pdf
    • https://uploads.strikinglycdn.com/files/3925915c-26e6-4ab3-9de9-02d1f90a4733/harry_potter_and_the_half_blood_prince_book_story.pdf
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_3d060e9e694a4b3fb5ab362b57ffcfd6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ab779e01-a6b3-44f1-bc00-412e81623158/nebepawatuf.pdf
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_fda99c3acb2b4ef5be15430ed7c0e751.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a47.bin
710e4a01b53343345d972a26b20dcf265024bb166ccea178967321f653c1ddf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 5116 bytes
font_01_sfnt_off00011ba5.bin
c818c06b6ccbe63a0157a816e9c4334961a408eaa3387576a6c347e4abc6de09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA5 11836 bytes

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