Malicious PDF — malware analysis report

Static analysis result for SHA-256 316f88484f4c71f7…

MALICIOUS

PDF

68.9 KB Created: 2020-12-21 12:01:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0cc831e2c0b076bdb71e0c27251dd43d SHA-1: 8875e90735a93b35f54cb4017cd6d641b81ef1ab SHA-256: 316f88484f4c71f766b8e32ae4ead90c38bb15e1e53dce58bcef0eab53e145b4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a significant number of external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs strongly suggest an attempt to facilitate phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/strik?utm_term=blade+the+iron+cross%2528+2020%2529 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417988/normal_5fa183f97b582.pdfIn PDF document text
    • https://kibugaduxabe.weebly.com/uploads/1/3/4/5/134510017/kanarel-suberarexol-livefila-rinexamekoda.pdfIn PDF document text
    • https://zawivipesanupi.weebly.com/uploads/1/3/4/7/134724715/ac89004732f5a89.pdfIn PDF document text
    • https://jugoruzaja.weebly.com/uploads/1/3/1/4/131407370/2589496.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490380/normal_5fd040e57ee5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476142/normal_5fcb5455e2c1a.pdfIn PDF document text
    • https://fozijiruzixusap.weebly.com/uploads/1/3/4/3/134317533/795424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489245/normal_5fb5a5dbc3de4.pdfIn PDF document text
    • https://giguwazepijev.weebly.com/uploads/1/3/4/8/134870268/bufepata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426072/normal_5fb5e1099afde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369486/normal_5fad3507f2f31.pdfIn PDF document text
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/bf0ac.pdfIn PDF document text
    • https://razulusajo.weebly.com/uploads/1/3/4/4/134467314/xoxesasurinex-famiz-foroba-kuraketazaga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410962/normal_5fc9231dd2ae2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/67941342021.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/alcohol_120_windows_10_64_bit.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_off0000d1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B4 5504 bytes
SHA-256: c5aa345d9a0aa2ad21dd4d377928d78c84670df1626071fcc2e69379aff549f0
font_01_sfnt_off0000e46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46F 10080 bytes
SHA-256: 858d28e0e3288fa34b931973b49e8c7e403d19e316e7ff55a65babac86928a07

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