Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa6b11b96959b44…

MALICIOUS

PDF

65.3 KB Created: 2020-12-09 07:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d21e28e1e0e7a0d3ab130b6f8365d2b0 SHA-1: 16046d3404c9f71ebfc7042102c948df1ee38b36 SHA-256: bfa6b11b96959b44a056d881c91a321b51acf7862aa75f202f84bac3fc62c57c
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/strik?utm_term=graveyard+keeper+ps4+science+points PDF link annotation
    • https://lujotovarox.weebly.com/uploads/1/3/4/8/134888889/gomeginefep_gifajowab_lukugusapivak_gogetilemew.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/d1c69b03ad12c61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_5f96cc154c85b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_5fbd5aca77899.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/d6f7a4c2-fc26-4408-8575-d1b6b97412b1/examples_of_biomechanics_in_football.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f06dd697-5195-470f-b9b1-7d1e7766ecd0/triangle_dining_table_with_benches.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/bryan_municipal_court_hours.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/47036197398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b24c776a-59cb-4776-b7fb-30911dd44a94/6767106562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/920fdc5f-5ee8-485a-98b4-34636a403eb0/86806398616.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_off0000c2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C6 5380 bytes
SHA-256: 4c34084764928ee26ca6ca9f3b5f56c868ca9beb0f4770c42bdf0d652bb65d16
font_01_sfnt_off0000d53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53E 10356 bytes
SHA-256: 2729d7f09ad4adf149e6d96c8b36c91db050ec57be4bc1ecbce5391ddf23caec