Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8e160367bdee26…

MALICIOUS

PDF

77.9 KB Created: 2021-04-11 06:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6879a49ce4ee55591465aa26cda11d0 SHA-1: 73d8632ec74686684389b5c7c201dc07340d9ed0 SHA-256: 6e8e160367bdee261b9c0423eacdc203c0d814491252bb882fa3e3bfb2a5f670
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 embedded URL pointing to 'seumenha.ru', which is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, appears to be related to an essay on climate change, serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=how+to+reduce+the+effects+of+climate+change+essay
    • https://cdn-cms.f-static.net/uploads/4494430/normal_600a3c3daa555.pdf
    • http://kipiluzebeguluj.iblogger.org/29626654481.pdf
    • https://cdn-cms.f-static.net/uploads/4485153/normal_605d94c4d1402.pdf
    • https://cdn.sqhk.co/waxusuxagaki/jbDchaC/xolemifitaditagasoj.pdf
    • https://static.s123-cdn-static.com/uploads/4419827/normal_6003dc670aa2a.pdf
    • https://cdn.sqhk.co/nisugavu/BSigigZ/kefakabanaroralemag.pdf
    • https://cdn-cms.f-static.net/uploads/4366311/normal_60300e801f692.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/votubukaxogilix/intangibles_balance_sheet_treatment.pdf
    • https://uploads.strikinglycdn.com/files/89cfa5d7-fc7a-4610-9b95-b8257e9d6401/how_to_invest_in_stock_market_for_beginners_youtube.pdf
    • https://uploads.strikinglycdn.com/files/228847c1-bd80-428c-b8fd-60032d649c7b/nigelerivelutiwukiruw.pdf
    • http://zoxutudirufusoj.epizy.com/48186967778.pdf
    • http://felawikemuda.epizy.com/sodium_hydroxide_safety_data_sheet_sigma.pdf
    • https://s3.amazonaws.com/zulezov/camera_360_apk_2015.pdf
    • https://uploads.strikinglycdn.com/files/9a4d4800-429a-4452-9ed0-aa58ae84ea5b/64003468934.pdf
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_c6e0c4b70ed7445aa3ea84eb1052a50a.pdf?index=true
    • https://s3.amazonaws.com/gedesisumi/86148645427.pdf
    • https://s3.amazonaws.com/wizakokowe/74791762540.pdf
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_d72b58e4afc34594a3697801fe15b7be.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0a8e6634-f7cd-4841-95f7-4370a14963cb/fepikilipeku.pdf
    • 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_off0000f401.bin
23a4cc6c1e7325757d777618c2a11371645552c9417c3f296b3dcc6b356c0a4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 5592 bytes
font_01_sfnt_off000106f1.bin
f92da72851858632bca4e9b51b3bda0bf1fabc6085e3f09e400cf48883754387		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106F1 10316 bytes

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