Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef70f5c808aafc9…

MALICIOUS

PDF

66.5 KB Created: 2020-11-25 18:03:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d6bfb1cdc068cf121a7913ec4f9af580 SHA-1: dc7159bb413333990a39c2bffa65d4d5cbff697a SHA-256: aef70f5c808aafc99c3f4a29e2c4cade1d1933d0026f1b3cfcee3aa08d04072f
244 Risk Score

Malware Insights

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

This PDF file contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the URL 'https://traffmen.ru/strik?utm_term=sims+3+bait+for+angelfish'. The presence of numerous links to disposable hosting and the ML classifier's high confidence score indicate a malicious intent to distribute further payloads or conduct phishing. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/strik?utm_term=sims+3+bait+for+angelfish In PDF document text
    • https://cdn-cms.f-static.net/uploads/4452594/normal_5fa60c61a89c1.pdfIn PDF document text
    • https://sikupawabur.weebly.com/uploads/1/3/4/6/134624396/64e6ce.pdfIn PDF document text
    • https://xalesuben.weebly.com/uploads/1/3/4/3/134368019/2359731.pdfIn PDF document text
    • https://fexifeter.weebly.com/uploads/1/3/4/6/134612515/1523651.pdfIn PDF document text
    • https://voledobaseju.weebly.com/uploads/1/3/0/9/130969813/xamizoxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445871/normal_5fb76aa8b9dc0.pdfIn PDF document text
    • https://valakafugajebe.weebly.com/uploads/1/3/4/3/134330742/2570015.pdfIn PDF document text
    • https://gosabotef.weebly.com/uploads/1/3/4/3/134332229/sarolapa_suwalufewekixu_fajosixanitowa_buziranufawi.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/degerutisig/3469437073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c931c117-2c1d-4e00-a405-47b6ac31420b/vafagegonigepegenijubumor.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/calculator_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/annotate_files.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_off0000c617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC617 5588 bytes
SHA-256: bb876a76eafaf589aa1a1960b3f0b8923c7bc199f8ce7e4cda65ed5d55935f51
font_01_sfnt_off0000d8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8ED 10788 bytes
SHA-256: 0198865397031ded4141976519b8d1d582d882fdf8dd30023904a2c1297d5621

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