Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b952ff538bab029…

MALICIOUS

PDF

76.8 KB Created: 2021-02-18 23:18:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 93c2bdfde158a3fc96993f8a1520fe68 SHA-1: 70a5c88e5e8a7ceed5c6817938414d26a4ea6d28 SHA-256: 4b952ff538bab029d00b5656fa5cc126b4286f2c220675142452332d71d9cb3c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://leonvi.ru/strik?utm_term=breville+air+fryer+toaster+oven+size', is directly embedded. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0', indicating a phishing or trojan payload. The presence of embedded URLs and the link farm suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://leonvi.ru/strik?utm_term=breville+air+fryer+toaster+oven+size PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490936/normal_5fe89eaa20a03.pdfIn PDF document text
    • https://cdn.sqhk.co/pojizurigos/lbjgfid/i_playing_god_meaning.pdfIn PDF document text
    • https://matiposokatogu.weebly.com/uploads/1/3/0/7/130739068/f6f6ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481675/normal_5fd6ac1fd065d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366371/normal_6002359f77389.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxoporerom/bYSidki/nowuzupapevusixuxuguxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421934/normal_5fe246d9b7e2a.pdfIn PDF document text
    • https://cdn.sqhk.co/molewekane/jfhgVW7/79008075195.pdfIn PDF document text
    • http://fb-pageunderreview.com/word_swipe_pic_online7qi3u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403534/normal_5fd799256595e.pdfIn PDF document text
    • http://vezerfa.xyz/69405077362b66ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401972/normal_5ff40d2c37d32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426551/normal_60264575dbf9a.pdfIn PDF document text
    • http://twitter-center.com/streetrace_fury_mod_apk8ezfz.pdfIn PDF document text
    • https://cdn.sqhk.co/viforoge/pdheJic/66863329811.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 5024 bytes
SHA-256: b90be7bc921709faf47abd6870cb14129b52700a781bafada52cd3efeb915154
font_01_sfnt_off00010186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10186 10836 bytes
SHA-256: 18548a2e5728a3bf7deb90b5baf21ea872c594b3bba1160a19365f6100619c01

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