Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2d94178c4c1751…

MALICIOUS

PDF

64.3 KB Created: 2020-11-25 17:08:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06080a268f9550d53a49064ffa3d0d77 SHA-1: fa61f5a092014f9fbe0f18303cba4a11b9522bc0 SHA-256: ab2d94178c4c1751f16e92b1423946a2138ac3f098ff75f6864ed73b178c6ff5
214 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain metadata related to 'wkhtmltopdf' and a title that might be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=experiment+1+boyle%2527s+law+answers
    • https://cdn-cms.f-static.net/uploads/4388815/normal_5fb3775e894d4.pdf
    • https://cdn-cms.f-static.net/uploads/4383300/normal_5f9c25d262c83.pdf
    • https://cdn-cms.f-static.net/uploads/4446275/normal_5f9d8b281dd9e.pdf
    • https://cdn-cms.f-static.net/uploads/4415740/normal_5fa77fc4d08ed.pdf
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/9743488.pdf
    • https://cdn-cms.f-static.net/uploads/4462727/normal_5fb322b1acbc1.pdf
    • https://cdn-cms.f-static.net/uploads/4474979/normal_5fbca32d4dfa0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/81bfb8b5-6b44-40b4-b349-1919dfe5a9f2/likegenudobazewazopawaz.pdf
    • https://uploads.strikinglycdn.com/files/e5bb8f66-a65a-45d0-aeef-fe220448b539/h2o_guides_alaska.pdf
    • https://uploads.strikinglycdn.com/files/4b1bc17f-c302-486d-9e80-6007ede2205c/sudhanshu_pandey_nityo_infotech.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be54.bin
bcb63dfbed892986cd1a73c8cfc532abc3880b2b10852df8c66d13864e3ce2d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE54 5412 bytes
font_01_sfnt_off0000d0c4.bin
b5809af7a8cea00a5ef547ec4eecfe19aa3488d5adcd5322b1a2d1ec1b66b46c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C4 10604 bytes