Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4120821197758e…

MALICIOUS

PDF

118.0 KB Created: 2021-04-08 01:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 0b5a275196de0b30a21587e504a621d2 SHA-1: 257355ef5a33ea5fe6a906cf8c5cf0dac736a4df SHA-256: 6e4120821197758e9dd6b48a2cd770af2be66e409c85c909504ce4a7994f5c42
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary focus on `seumenha.ru` and `bozenuvobe.iblogger.org`, suggesting these are the intended destinations for the attack. The document body, though heavily obfuscated, appears to be a lure related to technical diagrams, aligning with a phishing pretext.

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://seumenha.ru/strik?utm_term=2005+polaris+sportsman+500+wiring+diagram+pdf PDF link annotation
    • http://bozenuvobe.iblogger.org/dudizabuwovojonusaxebemu.pdfIn PDF document text
    • https://cdn.sqhk.co/zofagopipowi/XORJ8iL/jisaguposedetigupugul.pdfIn PDF document text
    • https://cdn.sqhk.co/kolazapikib/gg63aMK/merge_plants_zombie_defense_mod_apk.pdfIn PDF document text
    • http://xamejaduxak.22web.org/buku_olimpiade_biologi_sma.pdfIn PDF document text
    • https://cdn.sqhk.co/delopomixaba/bhiof91/68243855302.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/idKvaig/fojufurexajazura.pdfIn PDF document text
    • http://volosaty100.xyz/nifepuf6fy9.pdfIn PDF document text
    • http://xojitupozoded.22web.org/51522510418.pdfIn PDF document text
    • http://rixiroremijiw.22web.org/beef_noodle_soup_nutritional_information.pdfIn PDF document text
    • https://cdn.sqhk.co/lowanivari/MF3hj2f/zukegazenukuk.pdfIn PDF document text
    • http://socialwave.me/day_of_the_dragon_king_book_reporthe8l0.pdfIn PDF document text
    • http://paxijivatebul.getenjoyment.net/wedodarumifazufisadikenum.pdfIn PDF document text
    • http://giwosoto.sportsontheweb.net/59893352832.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/e8833d77-73d8-411b-a26b-466dae6dede9/potuxunuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72604077-ef39-4f25-8b04-24b03a5454c2/70998327559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e9b4cda-b003-4d04-b312-bebcc3d693f2/92066409566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0737929b-02fd-4548-9c21-88cc22657394/phrasal_verbs_beginners.pdfIn PDF document text
    • http://fokodema.epizy.com/edhelper_key_1_answer_id.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21df0755-bc1f-4046-88e4-492204402f2b/draw_a_man_test_indian_version.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_off00018f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F75 5756 bytes
SHA-256: a5c6a056b7386ff33cb5edd617599e4e618b61fe0dc2e8df1f8e6b70a51438e8
font_01_sfnt_off0001a30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A30D 11660 bytes
SHA-256: efe547dbb7952274e782a3b671f631ace83ae9f709e30fbd69b7cc3f1417c3fb

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