Malicious PDF — malware analysis report

Static analysis result for SHA-256 447dfa6a6080aa4e…

MALICIOUS

PDF

74.2 KB Created: 2020-12-26 18:50:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 96f98eeb4e43fc739af463f6c345833d SHA-1: 7004ab02b8b13acc0f9bfbddda7f9348f2378334 SHA-256: 447dfa6a6080aa4ed23b225832c46e438d5953be650df076f9a3260cdd931e35
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various URLs. One of these URLs, 'https://trafffi.ru/strik?utm_term=neon+sign+tumblr+iphone+wallpaper', is flagged as suspicious. The ML classifier and ClamAV also indicate maliciousness, suggesting the document is designed to redirect users to potentially harmful content or phishing sites. No scripts were extracted, but the structure strongly suggests a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/strik?utm_term=neon+sign+tumblr+iphone+wallpaper PDF link annotation
    • https://cdn.sqhk.co/kopubeno/hh9h6gh/action_hero_biju_trailer.pdfIn PDF document text
    • https://revunisukigi.weebly.com/uploads/1/3/4/8/134849871/3931797.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/TFRSYNr/genari.pdfIn PDF document text
    • https://rojigoziziza.weebly.com/uploads/1/3/4/4/134434225/maladupapi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379856/normal_5fb58806aa457.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/bhj8fgd/dumumifujiwenaniginede.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408976/normal_5fc6604d96e7d.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/jaYiiia/94550882306.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/5430013b-f64d-4b7c-b6bc-b7d3059b5061/41591167932.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4d2abe4-77e5-4559-a7f8-fed8df6eb4c9/27964770823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f838abd-7481-4e9d-ab9a-6b5f7ca017e2/xagag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/078dfbcc-38cb-4711-844d-5dfd5dbdb920/13758129573.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb6d4b08-0cc6-4b45-85bc-abab584dfe4b/cookie_clicker_2_hack_iphone.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_off0000cd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9B 5436 bytes
SHA-256: 4d78ceff337c33565c82634068a5f541317c19c9114e0fc22b380386cbad7cd6
font_01_sfnt_off0000dffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFA 10856 bytes
SHA-256: 9b3d5f3478c6534c151ef26fe57ec64f3b564baadf936d3828bfc257396c2d2b
font_02_sfnt_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 16204 bytes
SHA-256: abfd345a6ea1e62b83e5b81470e97c0bb38d81b9d626d8407e597eb2d2192f0c

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