Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d2b0e49a195e7a…

MALICIOUS

PDF

85.4 KB Created: 2021-02-24 08:55:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dc6003c939f39ab283f2195ba0d45f77 SHA-1: 29187ea3eac77a814abf00aef4008079eff82e9c SHA-256: 23d2b0e49a195e7ad8f31c3883bb8960222aceca3193049f7abf9a61546cf534
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 dynamically generated and point to other PDFs, indicating a link farm or SEO abuse for malicious purposes. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jacksth.ru/strik?utm_term=understanding+life+insurance+company+financial+statements+pdf PDF link annotation
    • https://dazarurizupe.weebly.com/uploads/1/3/1/1/131164120/7987023.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477651/normal_60048dbe9ef7b.pdfIn PDF document text
    • http://frukt.fun/marley_and_me_watch_online_free_full_movie0aiwm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421478/normal_5ff945cc5e8d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453902/normal_5fe54498c51ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416151/normal_60086016e407e.pdfIn PDF document text
    • http://walkover.me/idolmaster_million_live_guidemhegd.pdfIn PDF document text
    • https://zodoxofavuzawa.weebly.com/uploads/1/3/1/4/131437464/6645787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412588/normal_5fdb0bb0edb93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530910/normal_602eef5e6a87c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366632/normal_5fc663ccee535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_6011974568f75.pdfIn PDF document text
    • http://iqecoportal.ru/josamidogefigepem19qz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425238/normal_5fcb3d4e9c95a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485939/normal_600617d2b7cb1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://posewabenuxinot.epizy.com/dark_souls_3_dlc_ita.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001101f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101F 5568 bytes
SHA-256: 883424d37f361363f01298c9e20ef92dd04843d8f1a89faa03fd4e57fcc21311
font_01_sfnt_off00012305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12305 10840 bytes
SHA-256: 9e7eeadc535294f8fb8e79b416c5d6bf28a258465e785f7e88598b0c0dbb186f

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