Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a51d32d5ad3697e…

MALICIOUS

PDF

86.4 KB Created: 2021-04-07 00:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cf63be6f24f29c18eebfd7856c97378 SHA-1: 8cdf08b8bc4484c6d959f905a5f41c122e0504b8 SHA-256: 9a51d32d5ad3697ed9e306b6049dbbb1d2109b7c5e9d5c8b2b69c62c89af05a5
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 relevant documents like survival manuals. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a malicious intent to redirect users to potentially harmful sites. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

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://vilenefex.ru/wix?keyword=lifeboat+survival+manual+pdf
    • https://cdn.sqhk.co/sadinuko/ZIahf56/fujipewajigorozavema.pdf
    • https://cdn.sqhk.co/zetoreli/CaIyhaq/difaxelub.pdf
    • https://cdn.sqhk.co/masamiwe/g5giCer/lego_jurassic_world_iphone_cheats.pdf
    • http://simupujumojata.22web.org/how_to_read_english_newspaper.pdf
    • https://zofazozudu.weebly.com/uploads/1/3/0/7/130739697/5354119.pdf
    • https://cdn-cms.f-static.net/uploads/4466379/normal_604b230520936.pdf
    • https://lanigitekepag.weebly.com/uploads/1/3/4/3/134395773/gatulewunak.pdf
    • https://cdn-cms.f-static.net/uploads/4369311/normal_60500c7db7d39.pdf
    • https://cdn-cms.f-static.net/uploads/4454562/normal_60481c0bc3876.pdf
    • https://cdn-cms.f-static.net/uploads/4478132/normal_5fe93bfccf061.pdf
    • https://kazajibabagak.weebly.com/uploads/1/3/4/4/134467412/mirarodajotemi.pdf
    • https://wumaviki.weebly.com/uploads/1/3/0/8/130874148/lagatorilesa.pdf
    • https://cdn-cms.f-static.net/uploads/4367312/normal_601c866b53d7a.pdf
    • https://cdn-cms.f-static.net/uploads/4482027/normal_6050bac8dc566.pdf
    • https://xovifare.weebly.com/uploads/1/3/4/5/134524114/312783.pdf
    • https://joxipoxojig.weebly.com/uploads/1/3/5/9/135956636/segibe.pdf
    • https://cdn-cms.f-static.net/uploads/4457847/normal_601a2a029966c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://waxuvab.epizy.com/download_surat_yasin_dan_tahlil.pdf
    • http://jufakoxageponuz.rf.gd/rutirodatananuzufazevus.pdf
    • http://rabilovobixito.epizy.com/30462579199.pdf
    • http://genenapukiral.epizy.com/wodelixodowa.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_off000114ee.bin
9f34588e9f57993e10f800e98dec15fc189d35a45152ad6ef8e00d414cf87e2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114EE 5328 bytes
font_01_sfnt_off000126fc.bin
777afc67ff6f9274c9fcfaa4e78b29c890e68eb83a9ef8a289cd66623c069ec1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126FC 10764 bytes

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