Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b07f96004ff2c4…

MALICIOUS

PDF

83.7 KB Created: 2021-02-12 18:04:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3f9bceed29c1d6c473d272b1dd70ce90 SHA-1: 22012a4708642adae111d3ad43cfd99c3e8af11a SHA-256: a1b07f96004ff2c4aeca51afb837204eda96ef6c678519959d03a52ed279c89c
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The embedded URL 'https://jacksth.ru/wb?keyword=antithrombotic%20drugs%20pdf' suggests a phishing or scam attempt, likely aiming to redirect users to a malicious site. No scripts were extracted, but the PDF structure and URL indicate a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wb?keyword=antithrombotic%20drugs%20pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372702/normal_60228adb05fd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378405/normal_5fffc3c2750cc.pdfIn PDF document text
    • https://cdn.sqhk.co/zisujidixa/gg8Gmge/vexakepowunuxif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401692/normal_60142984c0d01.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/1gjihgj/minecraft_servers_pe_uhc.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/0jhAIhc/74092117747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410985/normal_6014454f2fab7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423145/normal_5fec3be4bfa55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450630/normal_5fd61ac2d3208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377403/normal_6012d514113d2.pdfIn PDF document text
    • https://cdn.sqhk.co/kagumuzom/hjj9hdY/99113556492.pdfIn PDF document text
    • https://cdn.sqhk.co/bimeniwog/ficuyhc/popcorn_trivia_app_store.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/mibiwivanetuj/bezipokorofogapave.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_off0000fd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5E 5220 bytes
SHA-256: 4e0d046677dd55537f63c289d1c312155e06703874a3fdc68cfca4e49ab939bb
font_01_sfnt_off00010ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE4 10904 bytes
SHA-256: 733d17af764e0f6f53f2c3b532da86937b901a4b43d33f05dd073513bc3bd496
font_02_sfnt_off0001341b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341B 4324 bytes
SHA-256: 781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60

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