Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f5b03309f2d1047…

MALICIOUS

PDF

78.6 KB Created: 2021-03-14 05:15:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ffc6ee76e824b6b8e18f105f5a84360 SHA-1: bf1031dcbf46dc3c7a49518e3d1e8268e4f0ce80 SHA-256: 2f5b03309f2d1047fd9cf9171041281dd1f5970ad89daa4b56490972604ce570
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting it's part of a link farm or phishing campaign. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/strik?utm_term=minister+license+laws+texas
    • https://soxopumejujaru.weebly.com/uploads/1/3/4/1/134108815/4762440.pdf
    • https://cdn.sqhk.co/wejawujagi/0EhgBZV/76793702711.pdf
    • https://cdn.sqhk.co/zetoreli/VjDheGX/jebamosulaga.pdf
    • https://cdn.sqhk.co/mowasikuso/q8m3hgj/31897729017.pdf
    • https://vofitusu.weebly.com/uploads/1/3/5/3/135301199/xopubokigofa.pdf
    • https://fivixevovisobav.weebly.com/uploads/1/3/1/3/131380347/3093681.pdf
    • https://lunipudazu.weebly.com/uploads/1/3/4/4/134462877/3256967.pdf
    • https://cdn.sqhk.co/tibidimewako/jjR39ji/mini_bike_racing_tires.pdf
    • http://maleev.online/lily_collins_unfiltered_deutschcx5wq.pdf
    • https://vudolexululuj.weebly.com/uploads/1/3/1/0/131070894/378535b8.pdf
    • http://lovemecompletely.com/78526765944xhjed.pdf
    • https://mafadojidakiwo.weebly.com/uploads/1/3/1/8/131871721/7c6e39.pdf
    • https://cdn.sqhk.co/jenetuwuda/Ydid2xu/zivopelizefumose.pdf
    • https://gawobomune.weebly.com/uploads/1/3/5/3/135317514/sesakutos_kizesiteburiz.pdf
    • https://nawenakugod.weebly.com/uploads/1/3/6/0/136048640/9645015.pdf
    • http://meetporte.xyz/libros_de_economia_basicos1fep5.pdf
    • https://vulefewaxamovu.weebly.com/uploads/1/3/3/9/133997320/fogibuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_27d5260fdfcb42bfaeb189c90e9b62da.pdf?index=true
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_ca5c3b6d4580499fb979df226cb2b9e8.pdf?index=true
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_826e3f59068d41edb5134d7004557ff1.pdf?index=true
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_4e423bfa95ab4835855f6a6bc1b59001.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaff.bin
2371367d08b2a77d37d1eeaf42eaa1617f8cd8ebf16cb6d565102c6bc5ed7ece		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 4636 bytes
font_01_sfnt_off0000fad1.bin
71780a8e03b079876f63c2091e74fbc9591db60dafd648c28bbd294e4555f9dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD1 10692 bytes
font_02_sfnt_off00011f2f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2F 4324 bytes

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