Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b30ad04df353a3f…

MALICIOUS

PDF

70.7 KB Created: 2020-11-17 00:50:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b65deecd65b24c207564fa326331e77 SHA-1: 1b31c69f857755e04b4ff6fef2a2beecd0b05ae8 SHA-256: 8b30ad04df353a3f5c9c54426373fe435c4743af8c4a2bcd3458ba44576c4d03
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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/123?utm_term=superfighters+hacked+full+screen
    • https://gepolurur.weebly.com/uploads/1/3/4/6/134610134/e26733e19d.pdf
    • https://xororowikaluna.weebly.com/uploads/1/3/4/6/134643421/mumapede_numak.pdf
    • https://dawerofe.weebly.com/uploads/1/3/4/3/134361643/b7e411.pdf
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5f874c8ad6079.pdf
    • https://sexiguviwuzokal.weebly.com/uploads/1/3/4/6/134687255/f533265.pdf
    • https://rulamajovag.weebly.com/uploads/1/3/4/7/134764486/rumidowafipebatiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/2333f5f5-4bec-4373-9ed3-1855cac4ce8c/81443076723.pdf
    • https://uploads.strikinglycdn.com/files/ced08b5a-aa73-4062-9479-4c2d404d8b63/dpendance_fonctionnelle_exercice_co.pdf
    • https://uploads.strikinglycdn.com/files/dab7b8de-4813-4f53-8666-4f0f06679366/sogulexejabobe.pdf
    • https://uploads.strikinglycdn.com/files/e3a40e34-922f-4db2-a0a7-2108abb5e223/pikiresa.pdf
    • https://uploads.strikinglycdn.com/files/4038c94c-672c-466a-9aa1-f577c41d72b3/run_3_swf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c778.bin
e9d570e5ac828aac545b37574fbb1c750f673e5c72e43e1e52246e6da2ca1631
pdf-font-stream PDF embedded font (sfnt) at offset 0xC778 5356 bytes
font_01_sfnt_off0000d9a2.bin
b9b7255770e8c168d83ee0e4b1a523a4688c59f7e6d9d3d7b57dea346ec464fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A2 11940 bytes
font_02_sfnt_off00010049.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10049 4324 bytes