Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d7ae4273c061b7…

MALICIOUS

PDF

81.9 KB Created: 2021-03-23 20:50:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e082b89948d978e1d49098c601cce7f4 SHA-1: 515a37eed4ae3a6cfd740e4dedc443943924d10f SHA-256: c4d7ae4273c061b7b832ef06397f25c34d177b1554794e0007af4ff5d95673a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs, with one pointing to 'ponafet.ru', which is flagged as a malicious link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/award?keyword=applied+physics+1+notes+pdf PDF link annotation
    • http://rikuluxolavasig.iblogger.org/planificacion_estrategica_de_recursos_humanos_definicion.pdfIn PDF document text
    • http://xoselugubo.22web.org/nubovitepator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487658/normal_602f6c682b513.pdfIn PDF document text
    • https://cdn.sqhk.co/tegasipitif/hh5piel/tatusesiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393181/normal_603aa0dad78e4.pdfIn PDF document text
    • https://cdn.sqhk.co/tudenireso/icwhcgj/50901932158.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413122/normal_604b74cf6dab3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418185/normal_600ebca8e72a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452161/normal_5ffd6ead0a9fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae20ed3a-1800-45ad-a7f9-9f55630e544e/wugamoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f61f325a-2592-4675-9efb-89a23a957ef6/why_is_my_temporal_thermometer_reading_high.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/859a9900-e883-4deb-82de-00907332a420/what_does_dapple_mean_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dba795a2-a372-4439-babe-0aa326d2d588/15851273056.pdfIn PDF document text
    • http://jewuvebasabam.rf.gd/come_on_eileen_sheet_music_flute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ad66fb8-b156-4c46-bb65-dd1cd460c569/dixie_chopper_mowers_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8fa78bb-3c3f-4ae0-ad42-0fe5d3df7401/development_as_freedom_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/141ae2df-a53c-4b9b-bf15-fd82c33503d0/bionic_turtle_frm_practice_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12f18d33-80ba-4a19-9fdd-1d117ac76ca7/25914962.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c70d4a0b-196c-4123-8dcb-2d4cffb89710/73623238560.pdfIn PDF document text
    • http://robeguf.epizy.com/baseball_rules_for_dummies.pdfIn PDF document text
    • http://xewipevi.rf.gd/nunutumaxota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a20cb3b-96c1-46ac-9a14-cc6584e4076d/38674904540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bca19ba-224c-42db-92a0-2c5692294d4d/to_kill_a_mockingbird_chapter_3_and_4_questions_and_answers.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_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 5080 bytes
SHA-256: c0ab6843aae0cdbd2eea0aa910702d13a852b83a9556d93b92403da76c008693
font_01_sfnt_off00010327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10327 3944 bytes
SHA-256: 0d35d3260e6dc0781e62471c49046c78abf9786d3e3e80bedf9518ea02e09839
font_02_sfnt_off0001127e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127E 11004 bytes
SHA-256: f3658dfd34afe8ca974a39fae7aaf6eb4024e09ad2ee0f32c8a099c0842d613f