Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ac5277ae1f99eb…

MALICIOUS

PDF

69.4 KB Created: 2021-02-25 18:48:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 46ab07ca021a50d397a3775222f725ab SHA-1: f47639a1a8649a4bb01dadad58b2cd17428e5040 SHA-256: a4ac5277ae1f99eb9d1b7d35464336572ddfdb0edf68d64ae3942aac7a8939f8
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that directs users to a site seemingly related to trucking school costs, but the URL itself is flagged as suspicious. ClamAV and ML classifiers strongly indicate maliciousness, classifying it as a phishing trojan. The PDF structure and embedded content suggest it's designed to trick users into visiting a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=how+much+does+trucking+school+cost+in+oregon PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388613/normal_6000c5907e04d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464734/normal_5feda30547572.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426270/normal_5fe12a920a7fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5fd3cd8f2735a.pdfIn PDF document text
    • https://cdn.sqhk.co/kosojilufut/hinehak/27945288295.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/ajhgejf/war_galaxy_album.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383571/normal_6025eacd6901c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405642/normal_602ea3a413537.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472208/normal_5fd3a17b251d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378404/normal_603079aa9855f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425912/normal_603471a6ce43e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454167/normal_600f289989507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5fd99122bb424.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383149/normal_5ffc5d4530bfb.pdfIn PDF document text
    • https://cdn.sqhk.co/mevexobuzur/Kcigwha/digi_film_romania_online.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/hiFx7jZ/gofomepomifubom.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/TZhcGie/mindset_book_carol_dweck_summary.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://s3.amazonaws.com/sezebepit/laminating_paper_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/nuxewojew.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/sidafukelidatusate.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/artery_of_percheron_stroke_case_report.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_off0000c881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC881 5140 bytes
SHA-256: c3f220206d81be58ef41b6c5c551d74e6c9bc5aa03abf0daca9f78b0fd9bea0b
font_01_sfnt_off0000d9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E3 9332 bytes
SHA-256: 7f021e06a67561928ac8cffe23eadb488fc5dc170684add4812a4f8871f9d97d
font_02_sfnt_off0000f9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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