Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e1fd98d3daadcb…

MALICIOUS

PDF

78.6 KB Created: 2021-05-06 02:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1552230860ce4c67d739be111e732155 SHA-1: 24011580bbd26cc25ba4d375882494ac159a3f63 SHA-256: c5e1fd98d3daadcbfaaabb3d5dc73a46935e3ba181f4fe72b9fb01a0a1ca7ff1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to 'Sennheiser wireless headphones manual', likely a lure to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://baarspo.ru/strik?utm_term=sennheiser+wireless+headphones+rs+120+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471509/normal_602a181af2b2c.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/dghdQhc/93629326746.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410414/normal_6056d65a44aad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451567/normal_60251a811b929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459792/normal_605237ed3a2ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416136/normal_5fc923273675b.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/jbEicrW/41141356703.pdfIn PDF document text
    • https://cdn.sqhk.co/niwonosorude/5jaibhj/playbox_hd_apk_2020_ios.pdfIn PDF document text
    • http://jubivigupowo.iblogger.org/41262529533.pdfIn PDF document text
    • https://cdn.sqhk.co/nurafurofopu/qif3Whp/87564923528.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375077/normal_5fee90b6abcd0.pdfIn PDF document text
    • http://dabuxupufudina.22web.org/dmaic_report_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390373/normal_606a08363202f.pdfIn PDF document text
    • http://wegixaro.iblogger.org/58709797468.pdfIn PDF document text
    • http://ribavid.medianewsonline.com/budapest_tourist_attractions_map.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dowijasimenazo.epizy.com/agenda_escolar_2020_para_imprimir.pdfIn PDF document text
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_b1c07ee2425b4620a61838452886d6c4.pdf?index=trueIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_4188621e54154f2b8c10bdc4db3eb1bc.pdf?index=trueIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_e1f244eaa37946ce854a505bd4f69b9a.pdf?index=trueIn PDF document text
    • https://df867d32-629d-4b48-af14-2fc5df20f827.filesusr.com/ugd/287761_12b2d15762f54b0f924fcbf1c606f996.pdf?index=trueIn PDF document text
    • http://legokejapo.atwebpages.com/cibola_burn_free_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 5720 bytes
SHA-256: dc51a7a7783c1274e11088ce04af8f3fb2ea2cf2011bd075d177e40ab0a86a4d
font_01_sfnt_off000106e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E1 11172 bytes
SHA-256: 3cb4d13c1c4d1fe6eed5e62cfc7fbba422edfa9687356be6d2f161574a179191

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