Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ddef124a1f9309…

MALICIOUS

PDF

82.5 KB Created: 2021-06-02 06:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 072bd4b0c8f4c2ef6f8e834d66d51039 SHA-1: 48b85bad75e43f1cebd0eb2ad16c0969522c5346 SHA-256: c7ddef124a1f9309ac14e88935b4c7807acc09bc61897caaf8b7d755c4e6aac8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a domain associated with phishing and malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or the distribution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://smidgel.ru/pbw?utm_term=climatizador+philco+pcl1f+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496216/normal_60191f8e64902.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408878/normal_6008a01c60d34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_6045bb913efb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406812/normal_5fefcf3e549fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475397/normal_605c6bbd6b197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426413/normal_600bc61001f4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367313/normal_6039ec380d8e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463824/normal_6059c427cec60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bemulopawed.pbworks.com/f/exercices_maths_exponentielle_terminale_es.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/f/9408441218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25bdf1a6-0c3a-48df-83e4-87cdb95ea9cd/gurulevijomabavu.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/w/file/fetch/144418872/ibrahim_tatlises_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f19ce147-b11b-40de-8295-453899a01249/does_2019_toyota_camry_se_have_heated_seats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f8d24ca-6cd0-4cb0-9cd5-949852caf3ec/betrayal_at_house_on_the_hill_widows_walk_errata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8c15066-6da6-4878-84ec-4bdc27f71ed4/jibobakas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30bc577a-0ff0-4af3-9c7a-69f7c1cc69a5/jidivofozevafurasub.pdfIn PDF document text
    • http://barumena.pbworks.com/w/file/fetch/144439647/nujigikudakusolasuzigetit.pdfIn PDF document text
    • http://wisarazed.pbworks.com/w/file/fetch/144465282/lagiw.pdfIn PDF document text
    • http://sutodoromar.pbworks.com/f/tuzomuzixevul.pdfIn PDF document text
    • http://pimepovume.pbworks.com/w/file/fetch/144480717/how_do_you_enable_2fa_on_epic_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a59c9ace-3b0d-4dbc-9a47-1e087f5ee22f/mumegunadekovokat.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_off0000feca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECA 5224 bytes
SHA-256: 05f4944c54fbd5ba7bc81169c1a36835c90534292c5ddea79ae154b9c2696b5d
font_01_sfnt_off00011069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11069 14592 bytes
SHA-256: c1a1833b438117bad948fb344b0dfb241552b84cd3d1c533629920243cd50e63

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