Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc66d0fa89aac08…

MALICIOUS

PDF

67.5 KB Created: 2020-12-24 23:40:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fb9e60af32aedbb6106dd57aca1517e0 SHA-1: 7022e918bbc9e39f3840a6e41ac1df43201fbc1e SHA-256: 6bc66d0fa89aac08ca5c5680eb048f74ad6e26ef55bfe178e59dc1599be76231
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to games and design, likely serving as a lure to direct users to malicious URLs such as https://trafffi.ru/strik?utm_term=piano+dream+tiles+home+design+fashion+game.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=piano+dream+tiles+home+design+fashion+game PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4415936/normal_5fde5828aca03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479678/normal_5fa7e7278dc69.pdfIn PDF document text
    • https://dunidapakepew.weebly.com/uploads/1/3/4/3/134319263/gunabimaf-fulijijej-nusufufu-dupatevotiga.pdfIn PDF document text
    • https://gilaxisob.weebly.com/uploads/1/3/1/4/131406303/3ac4b7a.pdfIn PDF document text
    • https://nazuvunu.weebly.com/uploads/1/3/4/4/134438845/c503652.pdfIn PDF document text
    • https://misadedami.weebly.com/uploads/1/3/3/9/133997414/fobibevu.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxebiseso/Vhfkgfh/wukovanimemefawetise.pdfIn PDF document text
    • https://sudororurupe.weebly.com/uploads/1/3/4/6/134602833/5799139.pdfIn PDF document text
    • https://cdn.sqhk.co/zowesifona/jfHgcmV/pov_car_driving_game_apk_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c58dd2a2-7fda-48ff-a0aa-8a6677292934/rubicundo_in_english.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B7 5320 bytes
SHA-256: 4725f6cbf93b97bc1fa37f32e182e279f48b2aa27dae793034bc008d026496fd
font_01_sfnt_off0000c8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A1 10172 bytes
SHA-256: 92911092b1f53be347618a7f1aa5c6c3d219400553ddcd01bcbc723b49a0e7dd
font_02_sfnt_off0000eba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA2 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2

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