Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c8d5bde7518954…

MALICIOUS

PDF

66.8 KB Created: 2020-11-18 03:08:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8a42c7efef458857b7ae5be30734d051 SHA-1: da13428b816913ff6fd7bb26e037d5179d4d0e21 SHA-256: 15c8d5bde7518954c79daa44852ee61e98ca971c65921605502e50f530da07d8
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the link farm structure strongly suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffnew.ru/strik?utm_term=weber+310+spirit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387232/normal_5f9a7746e29f3.pdfIn PDF document text
    • https://judemitipiru.weebly.com/uploads/1/3/4/3/134388438/41c08d4fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387929/normal_5f976cea6c632.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/7420657.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/wovitiku/bemin.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/42441656133.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/9968510528.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/spotify_premium_terbaru_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/vakego.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/lafinobuniwi.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_off0000c799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC799 5080 bytes
SHA-256: b907183415162880194150ec1a55376cdca70fdc58195dacf4d7eaf4fa0d2824
font_01_sfnt_off0000d907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD907 10772 bytes
SHA-256: 9bddce64046aab9cc1a7535bdf8b2fd9e45599c939fe6d0273a8f4bc6c6d58aa

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