Malicious PDF — malware analysis report

Static analysis result for SHA-256 9efc4d18a0a0f453…

MALICIOUS

PDF

71.0 KB Created: 2020-12-01 06:40:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 5597d65a09fe51565cd9e67ce4364303 SHA-1: 5e313806ece4ac005f7965d6c6bb449ec5fb3aae SHA-256: 9efc4d18a0a0f453e410972237a82fc2a5321014517d435850c88caf37e38f17
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URI pointing to a suspicious domain, identified as malicious by ML classifiers and ClamAV. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of an external URI strongly indicates a phishing or malware distribution attempt. No scripts were extracted, but the overall context points to a malicious document designed to redirect users to a harmful site.

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://trafffe.ru/123?utm_term=elevens+lab+activity+3+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372361/normal_5f8a8af1700c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381547/normal_5fa6fefd0f294.pdfIn PDF document text
    • https://lewejasolon.weebly.com/uploads/1/3/1/4/131437246/9944119.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_5f9b9f917d1b4.pdfIn PDF document text
    • https://tejebufu.weebly.com/uploads/1/3/4/3/134353082/safozowepadasusaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369161/normal_5f94d23d626a3.pdfIn PDF document text
    • https://difomojixi.weebly.com/uploads/1/3/4/3/134319012/5b111e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/25113375126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51916819-89da-4c02-82af-7779a19ccea8/boxukilibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ce6ee29-dcd6-4683-ac44-7a72beaeb5ff/xilevexizolodozawoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba0c7533-e00f-436e-b96f-48969e87e132/64203916090.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_off0000d687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD687 5308 bytes
SHA-256: 27e2b1928440695655641be0403efccf799eb862ec85325a32ee26eed4d42721
font_01_sfnt_off0000e8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C6 11444 bytes
SHA-256: 31db0de20042e85066c187be975df9c56d46a941a7cc1ac5b5c546ba24079b75