Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a10fa90e1bace4c…

MALICIOUS

PDF

76.0 KB Created: 2021-03-03 06:23:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17dcb7f56fc30e29681220e0de6bdacd SHA-1: 78909891a1d8a24c608643f1001e07741b433753 SHA-256: 0a10fa90e1bace4c34ba54c1a2fe927ba8a7ebea5383d2c0cfe3f25a4268fb66
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 'soxebez.ru' disguised as a pressure cooker manual. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting an attempt to obscure the true malicious destination. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing lures.

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://soxebez.ru/123?utm_term=all+american+pressure+cooker+manual
    • https://cdn.sqhk.co/pumopivosoba/lgdMjae/nevafukemewelulumimo.pdf
    • http://acupofjacob.com/how_many_different_types_of_knots_are_there1nn0v.pdf
    • http://shop-kid-toys.online/59912154988m726x.pdf
    • http://kowekigoduze.iblogger.org/1000_abaddalu_telugu_full_movie.pdf
    • http://prizinsta365.site/98422359799vxjnm.pdf
    • http://bejegom.22web.org/frasi_analisi_del_periodo.pdf
    • http://tipatav.22web.org/legacy_of_discord_guide_cheats.pdf
    • http://puxuwowu.iblogger.org/42160773208.pdf
    • http://musabonuluza.22web.org/35712244882.pdf
    • http://zoo-taxi.site/pomabafaob3kf.pdf
    • http://wiinorama.website/843657720514zlmo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://muvalinifotu.rf.gd/far_niente_chardonnay_2017_tech_sheet.pdf
    • http://lisokabosexipep.epizy.com/97801410093.pdf
    • http://nizulodezif.rf.gd/93331036674.pdf
    • http://bosulug.epizy.com/78692625922.pdf
    • http://sokutuwinal.epizy.com/draw_sheet_method.pdf
    • http://lutidufewujasa.epizy.com/anaconda_2_movie.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_off0000ee1f.bin
2b8927288874fafa27d8c73eff0b2cbe8d9bcb169bf9d144ef568e536553934b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1F 5132 bytes
font_01_sfnt_off0000ff7d.bin
d0fa0d5b48b8eefc2b8cf570903ce77e12da575b6d217e9bc6f29c55cbf970b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7D 10408 bytes

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