Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ebdccf434205453…

MALICIOUS

PDF

122.0 KB Created: 2021-01-03 19:46:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 136186d77942a135391810e35b0a5ff5 SHA-1: 709a56a02393a2e712a9c78fd1cd3ac92dadbf56 SHA-256: 0ebdccf434205453c17895e488b7b8b542655c4b455cd59d645402fd6931c047
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services, and one critical link to a known malicious redirector. This indicates a link farm attack pattern, likely intended to manipulate search engine results or distribute malware. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • 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/123?utm_term=dungeon+world+pdf+playbooks In PDF document text
    • https://dobidikomopal.weebly.com/uploads/1/3/5/3/135302797/be1b5012.pdfIn PDF document text
    • https://palujiro.weebly.com/uploads/1/3/4/4/134491920/rokuxa_lafen_bemekanabosin_vijibiwoju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373297/normal_5fbb0060d2d47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495691/normal_5fe9108ac7f46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401976/normal_5fc3425f7eb02.pdfIn PDF document text
    • https://nogafuku.weebly.com/uploads/1/3/2/8/132815296/3444213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375351/normal_5fb600e0be871.pdfIn PDF document text
    • https://tabikajodunel.weebly.com/uploads/1/3/0/7/130739544/wakinuluwadatog.pdfIn PDF document text
    • https://vazagivire.weebly.com/uploads/1/3/4/8/134874695/sogix-laser-gijadodi.pdfIn PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/d8a9ca48.pdfIn PDF document text
    • https://dilopapavi.weebly.com/uploads/1/3/4/7/134705518/5742876.pdfIn PDF document text
    • https://fosogaji.weebly.com/uploads/1/3/1/4/131455903/557826.pdfIn PDF document text
    • https://xonuvalax.weebly.com/uploads/1/3/1/4/131437330/komijatolejon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387816/normal_5fc1fc2df2c4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401538/normal_5f9e26b08238f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/waxapoz/61539755165.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001956a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1956A 3404 bytes
SHA-256: 48cd882c78f4ad8e6d3652c39f7bc6299257e28971a67700928b71555e7821b1
font_01_sfnt_off0001a19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A19F 5608 bytes
SHA-256: 743ca73851dfd0451f67f7dd848f6e0df5229dafa1306daa95c36b6d1da5ff02
font_02_sfnt_off0001b4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4DE 11092 bytes
SHA-256: 849eb6f57bfccaddcaeb4647db95322980aa92f052cc135cf6371663ec26ad42

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