Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab66083e5c7aa054…

MALICIOUS

PDF

35.7 KB Created: 2020-11-04 19:08:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d569ca232cc47a28fb4a1b5c76283e83 SHA-1: eb59b230673a31f9cd9ca8efb7e385ba35d6cb41 SHA-256: ab66083e5c7aa054d95d19e44f460b6880b0094950c9eb9521a9f0566b1da1e2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document appears to be a link farm designed to manipulate search engine results or redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=palmer+pdi+06 In PDF document text
    • https://renesixedobalew.weebly.com/uploads/1/3/0/9/130969137/6553263.pdfIn PDF document text
    • https://pivozedotafi.weebly.com/uploads/1/3/1/0/131070355/a7f91e4c9.pdfIn PDF document text
    • https://jonipafatanepa.weebly.com/uploads/1/3/2/7/132741476/zijuzatuxegolu_tekub_goxuwiwu_wowab.pdfIn PDF document text
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/futajumod.pdfIn PDF document text
    • https://jagamasukibo.weebly.com/uploads/1/3/4/4/134493784/659bcfd3063e23.pdfIn PDF document text
    • https://tejubodefi.weebly.com/uploads/1/3/4/3/134351051/deluguduv.pdfIn PDF document text
    • https://fijefozumomaba.weebly.com/uploads/1/3/4/4/134491855/piwesawi.pdfIn PDF document text
    • https://kilesikawagex.weebly.com/uploads/1/3/4/3/134372597/kipoguwukajijasozeze.pdfIn PDF document text
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/b3117.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/2b37c012-4a93-41c9-b538-318cf26434ca/74068046995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2f43a2a-ec2b-4449-b074-b8ab675f4e2c/59394884740.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/historical_origins_of_islam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98283472-3115-4e1d-9371-1cdfaa8c6836/social_structure_of_olmec.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_off00004ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CA6 5224 bytes
SHA-256: dd3cbb0a4584f182d7b00758d17abb8500f46b9da0c634d2f258d912f30121d7
font_01_sfnt_off00005e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E50 10616 bytes
SHA-256: 115a8bf34614fc2fb09ce05bf61750558a18a7af2048091f2fb428ed9bc04a23

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