Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0dcc456c2fef14d…

MALICIOUS

PDF

73.9 KB Created: 2021-01-08 09:06:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 956190617b927a1ab32d5cb368aeb2e3 SHA-1: f0f38f509e51d2d36763310ba5adddf6308eaba5 SHA-256: b0dcc456c2fef14d4cbe0c080969d81884ab126b006478b15030f73a225895f6
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external resources and appear to be part of a link farm designed for SEO manipulation. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically `https://cctraff.ru/aws?utm_term=idioms+in+a+sentence+worksheets`. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/aws?utm_term=idioms+in+a+sentence+worksheets In PDF document text
    • https://cdn-cms.f-static.net/uploads/4469136/normal_5fa3d4b06e624.pdfIn PDF document text
    • https://kikipaniwuno.weebly.com/uploads/1/3/4/7/134714830/mibuva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367911/normal_5f887e1205795.pdfIn PDF document text
    • https://vagobodowi.weebly.com/uploads/1/3/4/6/134600101/e8bd0ac01861.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370072/normal_5f8d3c37b75c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448100/normal_5fb980db78dfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_5fdb0c7b4b7d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467593/normal_5fcaf8e387a7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379491/normal_5f9dcbd5a192d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387938/normal_5fb5dbe652060.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419626/normal_5fc7d1a14237a.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/a5ab8dae-d9a9-4b27-a1fa-aa2255e63aca/demi-gods_and_semi-devils_1982_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c864235a-74d7-49bf-ae55-7d998ba7b3da/oxford_guide_to_english_grammar_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57cdb5b6-6095-473b-8360-a8b8833a5289/56961543626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a57c9ba-7bdc-433b-931d-616327db505e/giratukajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b68ebdb-e3c7-4470-94e8-3ce225da556c/sniper_extinction_apk_data_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa2e8a9a-d0d2-4ba8-9cda-544fa8aa3706/ninja_slicer_shredder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a7b3c00-0f2f-4104-8eab-3898c7d1c58a/71899618517.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_off0000e323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 5240 bytes
SHA-256: f22c0415db03ac5f55ce5604dd0aa117bb433d33c3526af795a75a482da79e71
font_01_sfnt_off0000f4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 10596 bytes
SHA-256: f3481b048ab93b237857afc1366c2751619199a0e021198b117c6139abe38584

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