Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a665f9d84702ea…

MALICIOUS

PDF

92.9 KB Created: 2021-05-28 03:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5f638280bdc2b5c65a8e0fb6202c04d SHA-1: 292302c8f73aa0970933ad8250ae4a6e4dfdc4f3 SHA-256: 13a665f9d84702ea6761bbec76e82461e8dbd69cfabf9e88b55314bea4814461
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://kuzutuzo.ru/strik?utm_term=ecole+des+fans+maman+trompe+papa+avec+tonton
    • https://cdn-cms.f-static.net/uploads/4369926/normal_601152ec23a06.pdf
    • https://gavaxavudo.weebly.com/uploads/1/3/4/5/134581950/469712.pdf
    • https://static.s123-cdn-static.com/uploads/4392854/normal_5ffffe62f01ea.pdf
    • https://cdn-cms.f-static.net/uploads/4488103/normal_605226e76cb21.pdf
    • https://lurenosofen.weebly.com/uploads/1/3/0/7/130740325/45ab52d3de36c.pdf
    • https://cdn-cms.f-static.net/uploads/4420430/normal_606a11961f297.pdf
    • https://static.s123-cdn-static.com/uploads/4420765/normal_5fc8fde96c07c.pdf
    • https://cdn-cms.f-static.net/uploads/4446019/normal_602c69831094c.pdf
    • https://static.s123-cdn-static.com/uploads/4404975/normal_6004f3aa3dfd9.pdf
    • https://static.s123-cdn-static.com/uploads/4485153/normal_5fceafa93e69e.pdf
    • https://linepapimufuto.weebly.com/uploads/1/3/1/6/131637640/7421746.pdf
    • https://bolafuba.weebly.com/uploads/1/3/4/6/134668532/b4a8919d5623b7.pdf
    • https://static.s123-cdn-static.com/uploads/4418362/normal_5ff215d65de21.pdf
    • https://cdn-cms.f-static.net/uploads/4476416/normal_6027c2c798dc2.pdf
    • https://static.s123-cdn-static.com/uploads/4452217/normal_5fc627e44b30b.pdf
    • https://jiwazakamofefuf.weebly.com/uploads/1/3/4/0/134041011/werus.pdf
    • https://static.s123-cdn-static.com/uploads/4470681/normal_5ff5f69ba26d7.pdf
    • https://vibitidit.weebly.com/uploads/1/3/4/7/134712982/28b47.pdf
    • https://lufegema.weebly.com/uploads/1/3/4/1/134132410/loverovexug.pdf
    • https://cdn-cms.f-static.net/uploads/4478387/normal_601b90a03a952.pdf
    • https://jowoxivodatut.weebly.com/uploads/1/3/4/8/134851862/zidoduvemikuz-mexixabatosila-jemetavur-waralizepefosaf.pdf
    • https://cdn-cms.f-static.net/uploads/4417809/normal_6065654359615.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0001219a.bin
a2781fe240157edfdb2f1a3e3795b7c99c07278f0988ac8957c6ffa896543965
pdf-font-stream PDF embedded font (sfnt) at offset 0x1219A 5320 bytes
font_01_sfnt_off0001339e.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1339E 1800 bytes
font_02_sfnt_off00013c2c.bin
15d3dafe17ee97c400d3598a1cc8e78667889e7b7e6dbabca09d9cd334241aa3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2C 13340 bytes