Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a31aa604a3229de…

MALICIOUS

PDF

72.8 KB Created: 2021-01-06 05:42:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 3ff6b15aeef4a02b4aa827dcbcece51f SHA-1: 76ee9c37f81d4979a5ec4aacb41231a78e4075b9 SHA-256: 8a31aa604a3229dedfe63492790f0a1b68fbfc964542d81dd96193f09f5a393a
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to a job application lure, suggesting a phishing attack. The presence of PDF-specific heuristics further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/aws?utm_term=chuck+e+cheese+job+application+form PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421943/normal_5fced5ae9d5b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384480/normal_5f8ca488da32f.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/jhqnkY1/linuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369796/normal_5feb17f3e5a85.pdfIn PDF document text
    • https://cdn.sqhk.co/poturofivat/jdgiUBJ/13897778455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416666/normal_5f9a081a52687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478393/normal_5fb9598da0008.pdfIn PDF document text
    • https://cdn.sqhk.co/silinetufid/j4riezX/farming_simulator_14_unlock_vehicles.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aefe65cb-116e-4496-a7e7-9fe562dd17cd/44965096538.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5940b6f-af7d-4fd8-87c6-8d4f4c4180b6/lonizogupuvuvajoreluf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95ce247f-7649-4d0a-8402-7674061bb786/one_step_inequality_word_problems_worksheet_6th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a14356f-5243-4a0a-9b43-f5703d8af35d/11606109389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f044248c-24e3-4558-9111-489a91704859/mimuguxiwexosoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64ce453a-acf4-454f-b965-6ebe964a11b2/28377018452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81005940-5baa-4f21-a1d8-9d98a11f91e8/jenub.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_off0000df76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF76 5440 bytes
SHA-256: c8a7da8db144580d9bd911ce5af374ab4768522d448e35ecc65d509b7ee8e1a5
font_01_sfnt_off0000f1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 10544 bytes
SHA-256: 50faea7f9378f04c6fd7f822e4d8df4fc82f543d3fbdeeaba4c353bbc4321f41

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