Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ccf41c91180389…

MALICIOUS

PDF

76.0 KB Created: 2021-04-07 10:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9b8bee97ca6afb905a4e24dcf1901d33 SHA-1: ada63be26d01ebcffe28cf07afdbb7d5fdb5f1da SHA-256: b8ccf41c911803895a82284b799c31993032d200590d2c5e9eca79fec795c356
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 URLs, with one prominent URL pointing to a domain associated with link farming and disposable hosting, suggesting a lure to external malicious content. The document body, though heavily obfuscated, contains references to 'basic accounting definition pdf' and is generated by wkhtmltopdf, indicating a potential attempt to disguise malicious links within seemingly legitimate content.

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://vilenefex.ru/award?keyword=basic+accounting+definition+pdf PDF link annotation
    • https://cdn.sqhk.co/fikubife/gihrege/reincarcare_cartela_vodafone_din_strainatate.pdfIn PDF document text
    • http://galajikimozupu.iblogger.org/1462635209.pdfIn PDF document text
    • http://domen3.club/2005_ford_f250_diesel_manual_transmission07aur.pdfIn PDF document text
    • https://sajofagexureleb.weebly.com/uploads/1/3/4/6/134652103/cf7e04f0b.pdfIn PDF document text
    • http://idealica-co.site/kowijofuritudepm08i.pdfIn PDF document text
    • http://wajoxur.22web.org/finuxe.pdfIn PDF document text
    • https://cdn.sqhk.co/tijovomiv/ijhfjix/wozawawetetakifesetoti.pdfIn PDF document text
    • https://nanewibogexuro.weebly.com/uploads/1/3/1/3/131382113/peruropol-xarezofubekamo.pdfIn PDF document text
    • http://mazafaka69pussy.online/ea_koetting_books6mpnk.pdfIn PDF document text
    • http://my-credit.info/kigojokozomanivutisl6b4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://funitavib.rf.gd/anxiety_handouts_for_adults.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7db79400-3e8a-4228-976b-b92eb5a9d746/how_to_calculate_bertrand_nash_equilibrium.pdfIn PDF document text
    • http://bidodabamurof.epizy.com/f_test_anova_table.pdfIn PDF document text
    • http://panejolaraluka.rf.gd/lepabakumodikusajeba.pdfIn PDF document text
    • http://jezowadu.epizy.com/18139585600.pdfIn PDF document text
    • http://bodumenijos.epizy.com/systematic_review_paper_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9671e132-8a69-4a1f-859e-d1523c216916/66379690175.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD887 5244 bytes
SHA-256: b13c011a2fc1b499822ac70dfe4bd0a9a236d97f3df0474598f540b0c5f45549
font_01_sfnt_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 10224 bytes
SHA-256: b2dea07d74349d354da08e1c9ee56c73a6ae2f12a73d4bdc2288bf59b05edfa7
font_02_sfnt_off00010d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9D 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8

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