Malicious PDF — malware analysis report

Static analysis result for SHA-256 90522a23720eb484…

MALICIOUS

PDF

68.6 KB Created: 2020-11-28 00:51:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 2dc8fd1fc3348d7d6f2dbfc8992b453f SHA-1: eddf849f6e988e0cfd0295a1e1c07adf3eee6598 SHA-256: 90522a23720eb4848cf4790c4e9dc3614ae22374ba94e7d563fbe4525b3599c5
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffmen.ru/aws?utm_term=fusiform+aneurysm+definition'. ML classification and ClamAV also flagged this file as malicious. The document body, though heavily obfuscated, appears to contain metadata related to the 'wkhtmltopdf' tool, suggesting it might be a crafted PDF designed to exploit users by directing them to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://traffmen.ru/aws?utm_term=fusiform+aneurysm+definition In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370278/normal_5f9c522615edc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380867/normal_5f910898d30e5.pdfIn PDF document text
    • https://tijisevivojo.weebly.com/uploads/1/3/4/5/134502531/3585204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379379/normal_5fb55ed81e252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404122/normal_5f98d36b68474.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/pafiganovavi/42487055030.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/emanation_ffxiv_tank_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/ramexusemivokezuxubepuso.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/fayju_amazing_frog_android.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/61103771373.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_off0000c52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52B 4960 bytes
SHA-256: 261eeb05623aba5895f6d03d8aa1a202fc4321c44d40455c0e2dd6c17059b946
font_01_sfnt_off0000d5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F4 9880 bytes
SHA-256: 973c2f228715a5202319412b4c7df26ee31514f3f9b2c26ccbb446aadcfd02a2
font_02_sfnt_off0000f7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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