Malicious PDF — malware analysis report

Static analysis result for SHA-256 f094e2550ebd327c…

MALICIOUS

PDF

69.3 KB Created: 2020-12-16 04:51:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a9f876a4ef7617255ff80c6b36a69ac1 SHA-1: f78a055a3e591ac74898b500dfb1e096f0006b86 SHA-256: f094e2550ebd327c54bba174c097855e4660baf7c49161c04f129bc4bf7c23c7
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://traffine.ru/123?utm_term=casual+employee+termination+letter+sample+pdf In PDF document text
    • https://japewilipo.weebly.com/uploads/1/3/4/4/134471591/lozukovufo.pdfIn PDF document text
    • https://lilepixot.weebly.com/uploads/1/3/4/4/134462463/puxumomesixozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422145/normal_5fad81ec7e9a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479454/normal_5faffc2b68949.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/b2524349-0d88-448d-9505-325e768865ef/zenudoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/098b2c07-e568-4e6b-b91d-e7ed9c7c41a5/67071662625.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc013b624b06a7eb3fa8a9b/t/5fc0e680a97599144e183acd/1606477441311/belt_of_physical_perfection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abfc094b-fffd-4aa0-985f-cc41803e4f3c/whom_should_you_see_at_the_bank_if_you_need_to_borrow_money_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79919b62-4efb-4481-8bef-1514ecf49c33/wazorenejoba.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc36057abaecd3318320830/t/5fc8782cb0f45b2a3d26b868/1606973485791/85194401668.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/626_area_code_location_time_zone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a166ccc4-d656-4439-9ed9-32a9c3bec349/i_go_to_seek_a_great_perhaps_looking_for_alaska.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/rtc_south_strip_transfer_terminal_address.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_off0000d4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BB 5196 bytes
SHA-256: ac1cdcd554c41cd34f35c7a73cad5f90c6f9f313079d9167a8d7c8fc89c906ed
font_01_sfnt_off0000e652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE652 9976 bytes
SHA-256: f8d15f79e424fac6cf3a40cf8def0a1058b1c30ffcce2434b4bc54096149b1e9

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