Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4f1af2ee7afc33…

MALICIOUS

PDF

67.9 KB Created: 2020-12-24 02:37:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7ce4c61bb2cfef61b78d9a9b34170fff SHA-1: b1069b2e6de1bfd58a647815eed0cc57bbd08b23 SHA-256: bd4f1af2ee7afc3385af9c4890bece2c3e9e0f72d9d16a08af0ad4f157759202
184 Risk Score
Tags
free-cdn-ebook-manual-lure

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 ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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 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?utm_term=haunted+run+down+houses In PDF document text
    • https://jizufolikoni.weebly.com/uploads/1/3/4/3/134349493/049800d.pdfIn PDF document text
    • https://wagofokixe.weebly.com/uploads/1/3/4/6/134694124/tuvonesusasuka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470223/normal_5fa799354a954.pdfIn PDF document text
    • https://duludogom.weebly.com/uploads/1/3/4/6/134673238/12582f13.pdfIn PDF document text
    • https://jugefisofewutep.weebly.com/uploads/1/3/4/3/134368120/1932755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381730/normal_5f909b090eec8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499309/normal_5fe14d4151a78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384150/normal_5fd192f9d9c98.pdfIn PDF document text
    • https://rulonejuwa.weebly.com/uploads/1/3/4/7/134749835/rofoxo_dosufimilojujur_wojurow_vaxileja.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/f4b95468-f651-4e67-a063-03ec7b07aa72/minecraft_modloader_1.2_5_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5c4bf71-2c27-41ea-98dc-c6b30dfd7970/85057533633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7705a21d-2a8e-465d-839d-e58e43391173/doxejupimigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3884256-5a80-47f3-a17d-1cd187da95cb/extensive_property_definition_in_thermodynamics.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_off0000ced5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED5 4936 bytes
SHA-256: e8f8a9c69ce6176e8fc8c039eb5e55f5e27011f724141de64bc829989578e538
font_01_sfnt_off0000dfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA3 10284 bytes
SHA-256: b905141945606c52ff096a9985fdd2bdf6c57255c6717876649caf866068eea4

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