Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b42600320238494…

MALICIOUS

PDF

78.3 KB Created: 2021-05-23 04:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 004fd430b9801db55f85323bcd7fbcf8 SHA-1: 9adb4ac44c61131b14fd1e733e17f86a9b7938af SHA-256: 6b42600320238494e0084d855932ce9ee7499f31b1230a7fcac4500103b80fe3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=luna+de+miel+en+familia+adam+sandler+reparto
    • https://gadudomarun.weebly.com/uploads/1/3/4/7/134705140/2176326.pdf
    • https://rafogemi.weebly.com/uploads/1/3/4/7/134754229/fizapo.pdf
    • https://warexuzema.weebly.com/uploads/1/3/4/6/134601764/1692104.pdf
    • https://static.s123-cdn-static.com/uploads/4484610/normal_5ff0dcaf18666.pdf
    • https://cdn-cms.f-static.net/uploads/4483623/normal_604ab8d855b87.pdf
    • https://cdn-cms.f-static.net/uploads/4413867/normal_605abeecd04c2.pdf
    • https://static.s123-cdn-static.com/uploads/4366055/normal_5fc82a4416e63.pdf
    • https://cdn-cms.f-static.net/uploads/4386349/normal_606720465cc22.pdf
    • https://static.s123-cdn-static.com/uploads/4406501/normal_5ff27944d97ff.pdf
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/parebigut.pdf
    • https://fenagedel.weebly.com/uploads/1/3/4/3/134316540/xinajobu.pdf
    • https://static.s123-cdn-static.com/uploads/4501041/normal_5fe527bf23cfe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lijulijowivaze/dafuvaviwuv.pdf
    • https://s3.amazonaws.com/lusabifef/exercice_algorithme_simple.pdf
    • https://s3.amazonaws.com/ruzumeb/indian_rangoli_design_template.pdf
    • https://uploads.strikinglycdn.com/files/82c3dbc5-af09-4bf6-99f2-5b09c20e7c49/viwebefuwapan.pdf
    • https://uploads.strikinglycdn.com/files/85f41362-8386-49fd-953e-f878abdbdeab/tegufugofifunugatuli.pdf
    • https://s3.amazonaws.com/jaxesabi/bodikeruwigubagorifilut.pdf
    • https://uploads.strikinglycdn.com/files/5779dfb8-5583-46fd-a1f2-9f17c083788d/79147947298.pdf
    • https://uploads.strikinglycdn.com/files/6839b3b6-8278-48be-a652-0ba45beccd5a/firopadexonowizu.pdf
    • https://uploads.strikinglycdn.com/files/da14d4a6-b94f-4b73-8cd0-3f452a98ddeb/movolabesuxapelutisidafot.pdf
    • https://uploads.strikinglycdn.com/files/891b5994-3549-4e28-8850-86bb818c2871/1624180023.pdf
    • https://uploads.strikinglycdn.com/files/733b8fba-bfa1-4321-a837-f731de3d03c0/docker_entrypoint_bash_not_found.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_off0000f070.bin
760563b21698f54f916c3eeee70ee0511ebae67061f140fe3e424f8906279a49
pdf-font-stream PDF embedded font (sfnt) at offset 0xF070 5128 bytes
font_01_sfnt_off000101d4.bin
0330974f5a24cb1e84e4bec60f8182979d2d4dd5550a7492654a95c224e79efe
pdf-font-stream PDF embedded font (sfnt) at offset 0x101D4 12216 bytes