Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f309aa43771b48…

MALICIOUS

PDF

95.7 KB Created: 2020-12-09 07:52:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8abb3ee8279bed32843e53fc78590450 SHA-1: 18b493944a86320fbccbd2fbd320272af69fa75a SHA-256: d7f309aa43771b48dc73413d99f2cdb071357f71f04b9dab39fe6c0a107896ab
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous links, including one pointing to known malicious infrastructure, suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/strik?utm_term=beauty+and+the+beast+chip+human
    • https://bejulukif.weebly.com/uploads/1/3/4/7/134746679/xigotuji_lokubotef_fesofirukibe_gejavujusev.pdf
    • https://cdn-cms.f-static.net/uploads/4445743/normal_5fbd5cd819cc7.pdf
    • https://static.s123-cdn-static.com/uploads/4478146/normal_5fca8571a69f5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/40786011-80e7-4fe3-ae16-4ceb0dab8e7f/city_siege_3_fubar_hacked.pdf
    • https://uploads.strikinglycdn.com/files/0a438f64-dcfc-488a-ad20-3950eaeb4a59/sidonuvuwakeman.pdf
    • https://static1.squarespace.com/static/5fc5933e8787e879898ba58f/t/5fc9c400822fbd3263de9447/1607058434085/11894604306.pdf
    • https://uploads.strikinglycdn.com/files/8b900487-e824-43fd-a99f-97fe3c8d854d/tokageruxe.pdf
    • https://uploads.strikinglycdn.com/files/d2e03cfe-5966-48b0-b84a-fe16e5ff8739/the_crew_pc_crack.pdf
    • https://static1.squarespace.com/static/5fc7a2ddabffab30daad4936/t/5fd00ca93308cf4e6fc83f3b/1607470250606/67081784547.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf48cea97599144eed5c59/1606371535016/guwavola.pdf
    • https://uploads.strikinglycdn.com/files/3f07d18e-db98-452b-8ad5-b44aeaca51a3/7335596005.pdf
    • https://uploads.strikinglycdn.com/files/6cb11bde-3e89-4a67-960e-cdc4c91a9b18/57154543069.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000136d0.bin
63488becb563e028e9471d387f35c26c98960d17d08ac97ad253524b23b6dd1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136D0 5476 bytes
font_01_sfnt_off0001494e.bin
fbf9a8db998225cc2a8689fbdaf529143d9dec62f70bbd44e4e5890fddafbbe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1494E 13028 bytes

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