Malicious PDF — malware analysis report

Static analysis result for SHA-256 087fe9c6facb1c48…

MALICIOUS

PDF

73.0 KB Created: 2021-03-18 08:55:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bbd6433cf4c574b42b8ff7dda9f74184 SHA-1: a62a2c27a9a2c1934cb7ea8eb4d69175bba9fe68 SHA-256: 087fe9c6facb1c487c64655cf99f221e99af3cf05a8347b168b7040d73d47092
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains a title that appears to be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/strik?utm_term=does+elgato+capture+sound PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485942/normal_6027458d3f098.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390680/normal_5fdeefc5004f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393511/normal_5fea385b9eec6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459939/normal_600522d1d0993.pdfIn PDF document text
    • http://bebinovixox.iblogger.org/budget_2020_malaysia_summary.pdfIn PDF document text
    • http://new-volosi.ru/weather_and_seasons_worksheets_for_grade_1x9b2n.pdfIn PDF document text
    • http://appletopshop.ru/how_to_change_a_whirlpool_water_filter_3mnzkg.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/94243a4e0d7d2e.pdfIn PDF document text
    • https://fiwerabonu.weebly.com/uploads/1/3/4/3/134347662/jijuzoko.pdfIn PDF document text
    • https://nixixufusolawig.weebly.com/uploads/1/3/4/8/134882604/zabixifubugiz-zevajajimimu.pdfIn PDF document text
    • http://reduslimitalia.website/purezodajigowx2.pdfIn PDF document text
    • https://toredakiwireg.weebly.com/uploads/1/3/0/7/130739366/adb28abe6.pdfIn PDF document text
    • https://mukozuzaze.weebly.com/uploads/1/3/4/2/134265885/6a0c26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370777/normal_5fef6f883cf84.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_7467d84d2059456f8339bdb5f6d89168.pdf?index=trueIn PDF document text
    • http://mugafazeporose.epizy.com/duvegozedefowulivesu.pdfIn PDF document text
    • http://gegepemu.rf.gd/70040240188.pdfIn PDF document text
    • http://vubalek.epizy.com/sarathi_kannada_film_song.pdfIn PDF document text
    • http://panejolaraluka.rf.gd/4297569684.pdfIn PDF document text
    • http://kodinola.rf.gd/acc_aha_guidelines_for_hypertension_2017_ppt.pdfIn PDF document text
    • https://2e21b658-2967-4279-8f18-a03590b678a5.filesusr.com/ugd/f5e1b2_5c866b56f27143ff94563a79b6ba195f.pdf?index=trueIn PDF document text
    • http://xexelakufakeze.epizy.com/autodesk_3ds_max_2016_xforce_keygen.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_off0000e09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09E 5240 bytes
SHA-256: eb44f5edf1c28ae31df543fabfe5f0b1d14fbe36e8261cb329b4c69d04782839
font_01_sfnt_off0000f286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 10560 bytes
SHA-256: b1ea57daf05226f440590cafbac90d5e24e7c393e12519ae200b9f39f4afa6ed

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