Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a98e418e09d64be…

MALICIOUS

PDF

87.1 KB Created: 2021-05-12 23:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cb0f023f1e8aa734226c700b35ab1d6 SHA-1: 66c8c8a618ae0606606d542a5898fed46beec553 SHA-256: 7a98e418e09d64be58511e32299b5af035991747794a0bd84a766812accdad85
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 numerous embedded links, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the 'link farm' heuristic indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=the+road+movie+streaming+online
    • http://universal-kirov.ru/what_if_movie_2010_watchz8b96.pdf
    • https://cdn-cms.f-static.net/uploads/4365627/normal_605a077490759.pdf
    • http://reduslimitaly-ufficiale.site/what_is_life_in_life_liberty_and_the_pursuit_of_happinesswf1ca.pdf
    • http://usacarins.com/jabukudoxiur9ql.pdf
    • http://phtech.site/xuzolafogty43m.pdf
    • http://trening-ekaterinodar.ru/formato_de_carta_responsiva_para_trabajar47zl1.pdf
    • http://mutujejeturuduf.medianewsonline.com/59809909921.pdf
    • https://cdn-cms.f-static.net/uploads/4379613/normal_6059ea7bd30bd.pdf
    • http://vobafoselalulor.mypressonline.com/australian_english_grammar_book.pdf
    • https://static.s123-cdn-static.com/uploads/4485329/normal_5ff1302ec70b6.pdf
    • http://zememor.sportsontheweb.net/genetic_skin_disorders.pdf
    • https://static.s123-cdn-static.com/uploads/4484804/normal_5ff2ff2db00d2.pdf
    • http://8gusevshop.website/what_does_the_bible_say_about_new_heaven_and_earthz6old.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/0ec1f7ea-49d0-42ee-be86-664cb6e39d1a/the_stand_movie_1994_cast.pdf
    • https://uploads.strikinglycdn.com/files/a4126544-24f3-4554-b361-a0f39d3b13d6/51904673035.pdf
    • http://gudukiderunusu.myartsonline.com/wonobugitos.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010910.bin
0d523b52439c6dab13103db6c41d3ace2db78e850d4a6f338c252349d55925c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 5036 bytes
font_01_sfnt_off00011a0b.bin
6a5b2b04038923366facc343f853dd7bf0826d0b0c2db2efd06bcd2854b6dfbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0B 10960 bytes
font_02_sfnt_off00013f68.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F68 4324 bytes

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