Malicious PDF — malware analysis report

Static analysis result for SHA-256 497d4d35eaadaf46…

MALICIOUS

PDF

77.7 KB Created: 2020-11-23 16:37:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 47c8e734c1df5fd383fc21a78be84623 SHA-1: 14c0c4ae3291262b9e58d15e977279153e0fb82a SHA-256: 497d4d35eaadaf4693c85c171ecd8561882309bbc0e204d21a2829173373c7f3
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for a malicious redirector link and a PDF link farm. The embedded URLs, particularly 'https://traffking.ru/strik?utm_term=the+bell+jar+genre', suggest a phishing or malware distribution attempt. The presence of numerous external PDF links indicates a coordinated effort to distribute content, likely malicious, through a link farm strategy.

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
  • 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.
  • 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://traffking.ru/strik?utm_term=the+bell+jar+genre In PDF document text
    • https://cdn-cms.f-static.net/uploads/4471719/normal_5fa99047e09da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5f8745f3401b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_5f9e0aa746a33.pdfIn PDF document text
    • https://worivoka.weebly.com/uploads/1/3/4/5/134588103/ac028baff762ae.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/zirojopemup/korejabawurom.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/zupidaxoxemajulog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0d63467-a09b-40df-a339-744b9e0cc80a/ventura_unified_school_district_jobs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9448449-fb7b-406b-984a-5743dca9e786/83007105108.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/90754886740.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/emson_pressure_smoker_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/my_side_of_the_mountain.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/17531987661.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/vaxaledexunavuj.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_off0000f4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 4932 bytes
SHA-256: bee03b35e85416f9104b3560f86efff08084af6927345c9aef1657a2f8f6dbdd
font_01_sfnt_off00010581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10581 11216 bytes
SHA-256: 6d69a60fa59e21ea48d78e3a1079ccc940ef67bb4907ab4ca4c20607aff41a80

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