Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c75b902aef6f4e…

MALICIOUS

PDF

76.2 KB Created: 2021-05-28 06:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb7f9f2c89152ef1e29eb5c1616edf52 SHA-1: ebcbdf7653aa8a2e5d3d8354507df08c97de8a53 SHA-256: 85c75b902aef6f4e256828f4b873b2b3b9ed175ca0d68d9dc9be0f79128b3c4d
164 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 pointing to Weebly-hosted PDFs, suggesting a link farm designed to attract search engine traffic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a download button lure further supports a deceptive purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/strik?utm_term=kinetic+typography+intro+after+effects+template+free+download
    • https://bojubuloxobepi.weebly.com/uploads/1/3/0/9/130969884/natizix_munajajoxosoxa_mepobo.pdf
    • https://cdn-cms.f-static.net/uploads/4465703/normal_5fd2030a97e80.pdf
    • https://takokapaxuv.weebly.com/uploads/1/3/0/9/130968961/roweginibaxerokano.pdf
    • https://rutedidatares.weebly.com/uploads/1/3/4/4/134490949/c0560038f18.pdf
    • https://xukejexen.weebly.com/uploads/1/3/4/4/134480318/wotuv.pdf
    • https://rufajesovulibo.weebly.com/uploads/1/3/4/2/134235528/1470874.pdf
    • https://cdn-cms.f-static.net/uploads/4464313/normal_605dd496052f5.pdf
    • https://tudegikugil.weebly.com/uploads/1/3/5/3/135317618/e45b40.pdf
    • https://golisoni.weebly.com/uploads/1/3/1/4/131437826/8001162.pdf
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/8323757.pdf
    • https://static.s123-cdn-static.com/uploads/4492600/normal_5fee9219c99fd.pdf
    • https://cdn-cms.f-static.net/uploads/4374708/normal_6022d03611307.pdf
    • https://static.s123-cdn-static.com/uploads/4487200/normal_5fca03a416b46.pdf
    • https://tejebufu.weebly.com/uploads/1/3/4/3/134353082/884351.pdf
    • https://tetavezodumop.weebly.com/uploads/1/3/4/6/134645623/xolul.pdf
    • https://cdn-cms.f-static.net/uploads/4445129/normal_603bf8662d5b7.pdf
    • https://cdn-cms.f-static.net/uploads/4393486/normal_6009f47f42062.pdf
    • https://sotokogel.weebly.com/uploads/1/3/4/2/134266154/dovujoxedovuves.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e489ff85-d84f-492b-8ef2-6ffc5e7d603a/does_stretching_relieve_sore_muscles.pdf
    • https://uploads.strikinglycdn.com/files/94789f9f-e954-4610-81ed-f56bd069d33e/cuento_funes_el_memorioso_resumen.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_off0000e00f.bin
8c153f6c178775b429f7c458916151a86fd7ce2bc4a0d65695d9a1e3db7f5104
pdf-font-stream PDF embedded font (sfnt) at offset 0xE00F 5732 bytes
font_01_sfnt_off0000f38c.bin
c99cc55b55f2067aaaa3140b8c378a78a171cb83877594024fe82caf1b69afb0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 15440 bytes