Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c95a5614e13327…

MALICIOUS

PDF

70.9 KB Created: 2021-01-11 11:27:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 57dc1a6dd6aba905874e1591c2d33c37 SHA-1: e91e917737f7fcc02a011310f005ffe594f3726d SHA-256: c7c95a5614e13327e18adc0f0e5a18480c0336539fce1e9ddd83aa7e2350c2ef
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffking.ru/123?utm_term=inquietos+del+norte PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388282/normal_5fa70f8645c35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453579/normal_5fba7c6159b82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391636/normal_5fc8e28ba5669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376849/normal_5f89feaa7ac26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373769/normal_5f94d9ed966ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481270/normal_5fd3bce94d72b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404105/normal_5fa82ac6decf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380701/normal_5fb8ac8a824fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484834/normal_5fd1f3a8a4ed9.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/bibejovixapis/70849168940.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC297 4672 bytes
SHA-256: 42b21b4c8c8c973fac8110be239b56d30a720bafcde82ca126660ef883349bc2
font_01_sfnt_off0000d283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD283 11624 bytes
SHA-256: a0181d6a3cbd317d0faa675aa1bc5bf18a476fb6f537c86134b72105bd58f082
font_02_sfnt_off0000f8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B6 16168 bytes
SHA-256: bcfecb9fde4b74e4a2b692e15caf305b2988a1cfe4c6386614002e38d35feb86