Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf246a56c0a254c4…

MALICIOUS

PDF

75.7 KB Created: 2021-03-24 22:59:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b50ae9330e0cff3aa8e9a6d6300b6c73 SHA-1: b7b9e33a85d204f22e191932e4b0fa182c3f47e3 SHA-256: cf246a56c0a254c457026fced194ab658303af09d5245c0131268fe149c16687
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 a primary suspicious URL pointing to 'dugedepap.ru'. The document body, though heavily obfuscated, suggests it's a lure related to a search query, likely intended to trick users into visiting the malicious domain. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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://dugedepap.ru/award?keyword=antonio+tauriello+toccata+pdf PDF link annotation
    • http://chategratis.online/porter_cable_150_psi_air_compressor_drain_valved7oqm.pdfIn PDF document text
    • http://lobarularexe.iblogger.org/black_back_wallpaper.pdfIn PDF document text
    • http://shortsomfj.space/troy_bilt_tb280_es_manualr23py.pdfIn PDF document text
    • http://nazhivy.net/heal_yourself_101_book7we2p.pdfIn PDF document text
    • http://faligabab.22web.org/gegopitufevek.pdfIn PDF document text
    • http://vokugomi.22web.org/design_and_analysis_of_algorithms_for_mca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_2b8625af10ef4d83acebe4eb9a450d2a.pdf?index=trueIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_e5bbc1e93de24c79adb38373b7e03ec6.pdf?index=trueIn PDF document text
    • http://savekuf.rf.gd/29979328425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b917626-4c2d-4441-a79d-682aab188125/mepasakifazugesavomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb4f6700-58f7-4756-9f99-5c3995c87947/suzugewomoxajitekomerop.pdfIn PDF document text
    • https://8f1ef4f7-3f23-41ef-a3d6-4e5873a175a2.filesusr.com/ugd/d318ce_f5e9939052cd4bea842bc8d1d8fa1726.pdf?index=trueIn PDF document text
    • http://dojajenubiti.epizy.com/gobiberu.pdfIn PDF document text
    • http://sevajujumobilo.epizy.com/types_of_hydraulic_actuators.pdfIn PDF document text
    • http://femejuzi.epizy.com/pozadajibaxivopamutevudul.pdfIn PDF document text
    • http://mepusafufeja.rf.gd/combination_reactions_worksheet_1.pdfIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_4ccc7785879f4db1b782351e2ff56fb7.pdf?index=trueIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_3ffec20c845c4af480e49607c1583fca.pdf?index=trueIn PDF document text
    • http://vebadivikini.rf.gd/cantigas_de_santa_maria_score.pdfIn PDF document text
    • http://dufexupomom.rf.gd/russian_wire_guided_anti_tank_missile.pdfIn PDF document text
    • http://retobawunabe.rf.gd/24vdc_buzzer_datasheet.pdfIn PDF document text
    • http://gomupinoteripa.epizy.com/division_practice_worksheets_4th_grade.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA08 4844 bytes
SHA-256: 2b6d971c677d752c4f2d8c18c962df0e224ee0a252ba9f883015d5debc7a26b2
font_01_sfnt_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 13008 bytes
SHA-256: d47ca2ef3fb49cb883cb682eda711e69754b4405cc0a2fe0be4edcaca3af55d0
font_02_sfnt_off00011340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11340 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378