Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ffc96c19138e80…

MALICIOUS

PDF

63.2 KB Created: 2020-11-22 03:50:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b7ebaf98f2c5b0bac43db438d59468a SHA-1: bf93281c63c0e08a1f6a92a2503660bc8fcd0e1d SHA-256: a2ffc96c19138e80c21ec3650e2ac52943fb781e0ef5d2b36b6e00adf3e5acf2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URL points to a domain associated with phishing, suggesting the document is designed to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=funny+car+decals+for+windows
    • https://cdn-cms.f-static.net/uploads/4369304/normal_5fa7fc0ecc5d7.pdf
    • https://kisuguwaki.weebly.com/uploads/1/3/4/3/134388310/5014640.pdf
    • https://zozolexiwu.weebly.com/uploads/1/3/4/3/134343356/deguj_bafeli.pdf
    • https://cdn-cms.f-static.net/uploads/4481408/normal_5fb83d7247eee.pdf
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f86f47359702.pdf
    • https://cdn-cms.f-static.net/uploads/4369933/normal_5f9988bc258f3.pdf
    • https://nojarotawufa.weebly.com/uploads/1/3/4/3/134313922/c9134.pdf
    • https://zezefikopupom.weebly.com/uploads/1/3/4/6/134686460/vusarugivonuv.pdf
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/dupamed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6a5ffe96-8df4-4172-baf4-a2e99204aa7f/wenaruzawumapafafuju.pdf
    • https://uploads.strikinglycdn.com/files/9b1e84e1-1ee1-41f0-b22c-1f0778124a6e/ev3_line_follower_download.pdf
    • https://uploads.strikinglycdn.com/files/f823ab0a-7bcc-4698-adce-3a8637f00df2/cube_world_download_2016.pdf
    • https://s3.amazonaws.com/lodazojamuva/phong_nguyen_dr.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_off0000bbec.bin
2007b656b3d1fbbef006155535970a78790f27a1b1850bfb5dac7c02d703d71c
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEC 5164 bytes
font_01_sfnt_off0000cda8.bin
eb993eb91fd0fbab3d6130e25708972537996583b54b860be7083c78323df5a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA8 10152 bytes