Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2f954dcadd5a62…

MALICIOUS

PDF

64.6 KB Created: 2020-12-16 22:41:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d82777a4d633fe7df20e10c0668ef5c SHA-1: 65cb90e41681099b5c3826835e388d8b204923b1 SHA-256: 8f2f954dcadd5a6201ff7cbce52d17d0d5f8edb7d42f67ded4d44a4082fd7039
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm operation. One of the primary URLs, 'https://trafficel.ru/123?utm_term=city+escape+lyrics+dear+hunter', is directly referenced. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm and the detection suggest exploitation of PDF vulnerabilities to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafficel.ru/123?utm_term=city+escape+lyrics+dear+hunter
    • https://cdn-cms.f-static.net/uploads/4379732/normal_5fbc2c638e52b.pdf
    • https://xesapexoxes.weebly.com/uploads/1/3/4/6/134633169/nuzesixawuzejokuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc51675e2fce462bca6e6c5/t/5fc9eda481b71b40859989c2/1607069093227/toca_life_city_secrets_noah_knows.pdf
    • https://static1.squarespace.com/static/5fc10ac260f2895dc1e8a19d/t/5fc48593f81c9a2a0c33026e/1606714771525/inficon_d-tek_select_manual.pdf
    • https://uploads.strikinglycdn.com/files/9da6c076-c69f-42ec-b3ac-8dcd91e98d67/20397026779.pdf
    • https://static1.squarespace.com/static/5fc0e2ed17e7202640ea1bf0/t/5fc59e193570fb44d1c404f8/1606786585985/34973661760.pdf
    • https://static1.squarespace.com/static/5fc6c21c504bb4653ce0bdb8/t/5fcd566ecded405bb8e90672/1607292528071/ieee_programming_language_ranking_2020.pdf
    • https://static1.squarespace.com/static/5fcebc7724192469dc87fef5/t/5fd70f0d89566e781f6673ed/1607929620032/zuxutixekinuxuzopodibamit.pdf
    • https://static1.squarespace.com/static/5fc6c0f08651a04751934446/t/5fd6d83889566e781f60cfc1/1607915577325/blast_off_to_reading_teacher_s_guide.pdf
    • https://s3.amazonaws.com/nunakixuma/96028089727.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_off0000c502.bin
1b6987deca162054073612b6d8a669a667a145c99d645f717480bebb9df43b18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC502 5168 bytes
font_01_sfnt_off0000d68d.bin
80e27801c599a3627c415d740e77abf68be18d7c4518c766534b089b59ea5e10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD68D 9112 bytes

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