Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e232542e3b4b01…

MALICIOUS

PDF

100.9 KB Created: 2021-04-14 18:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ec3ca176aae114c860dfa598d6ec445 SHA-1: bc2143e2e17b4869b8c6d0c8b5443be937ed3b3a SHA-256: 78e232542e3b4b0119a9be42e0785ac28b0666d3df844678aa18eb761a11d9cf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as legitimate documents, indicating a link farm or phishing attempt. The primary malicious URL identified is 'https://pelibifir.ru/strik?utm_term=the+thrill+of+the+chase+poem+by+forrest+fenn', which likely serves as a lure for further malicious activity. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://pelibifir.ru/strik?utm_term=the+thrill+of+the+chase+poem+by+forrest+fenn
    • https://cdn.sqhk.co/zowonefaso/jjeYkgM/skylanders_superchargers_portal.pdf
    • https://cdn.sqhk.co/rojarimeg/5njdib0/48794177212.pdf
    • http://vukufitu.mywebcommunity.org/old_english_heroic_poetry.pdf
    • https://cdn.sqhk.co/neseleko/HAcji6O/ultimate_viking_empire.pdf
    • https://cdn.sqhk.co/nonebizi/ithhTV7/2018_fantasy_football_mock_draft_bleacher_report.pdf
    • https://static.s123-cdn-static.com/uploads/4368486/normal_5fcf5e3932144.pdf
    • https://cdn-cms.f-static.net/uploads/4460076/normal_6025aa9b18f8c.pdf
    • https://cdn-cms.f-static.net/uploads/4413235/normal_600e77b2bc0a7.pdf
    • http://sarawavenudiwap.mygamesonline.org/burger_king_employment_application.pdf
    • https://cdn.sqhk.co/kajurineg/igiIje9/36357820725.pdf
    • https://cdn.sqhk.co/jokutevek/dSgihfO/codic_start_to_code_learn_programming.pdf
    • https://static.s123-cdn-static.com/uploads/4477649/normal_5fc9e67de1eb7.pdf
    • https://cdn.sqhk.co/mogudekusab/aAGYggj/vitalsource_bookshelf_to.pdf
    • https://cdn.sqhk.co/dutudovajud/c1eJra0/ho_slot_car_racing_videos.pdf
    • https://cdn-cms.f-static.net/uploads/4366401/normal_6054510133d2c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_656a105a143b42ee98f6654453f05514.pdf?index=true
    • https://df867d32-629d-4b48-af14-2fc5df20f827.filesusr.com/ugd/287761_236d8b646614415eb14581f3f5da696b.pdf?index=true
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_4652ad4d5ae8461bb15bbb4c60f9f7cc.pdf?index=true
    • https://4edd92ed-4e96-4c3d-a837-a16c7246ae9e.filesusr.com/ugd/7c3149_d6f50fc53f024a62a194cea0861d7933.pdf?index=true
    • 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_off00014bc2.bin
e799ccbb8f122ad974fcb101c8d6d76cbc895dfb27948b58bfb940b3e31499be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC2 5444 bytes
font_01_sfnt_off00015e22.bin
cdbb6f3204f2174076defc1a9ccd16a0b5da3e3ecc2c51f2e87cd7ba7cbbdae9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E22 11224 bytes

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