Malicious PDF — malware analysis report

Static analysis result for SHA-256 339b6a6a38cb3d97…

MALICIOUS

PDF

66.5 KB Created: 2020-11-22 10:21:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c07ca6a2be063c965625472f55673c1 SHA-1: 16e09e44c1d1c5cd6e1a8bd27e82bdee26076aaf SHA-256: 339b6a6a38cb3d973dd2711f66cc4d816826cd6014694cb810af99548a49a8ce
214 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are hosted on Weebly and appear to be part of a link farm. One critical heuristic indicates a link to a known malicious redirector, suggesting the document is designed to lead users to malicious content or phishing sites. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://ggtraff.ru/123?utm_term=kite+runner+themes+essay
    • https://sopopubepomexak.weebly.com/uploads/1/3/4/2/134265445/sizip.pdf
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/xegejiv_noraru_zonovoduborebo.pdf
    • https://vepakuwaderim.weebly.com/uploads/1/3/4/6/134699920/makuxewulutapur.pdf
    • https://rulamajovag.weebly.com/uploads/1/3/4/7/134764486/samupupazumabasewose.pdf
    • https://cdn-cms.f-static.net/uploads/4381536/normal_5f9253819cc10.pdf
    • https://cdn-cms.f-static.net/uploads/4465142/normal_5fb2d6e9cb296.pdf
    • https://cdn-cms.f-static.net/uploads/4374984/normal_5f8ee4a22088a.pdf
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/1982379.pdf
    • https://garegijewavib.weebly.com/uploads/1/3/4/3/134389285/0121519e36c93a.pdf
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/ff06dfdf.pdf
    • https://garusase.weebly.com/uploads/1/3/4/6/134634063/ab8ea7d1c90d0f3.pdf
    • https://gazododisup.weebly.com/uploads/1/3/4/7/134720907/xuxilu.pdf
    • https://cdn-cms.f-static.net/uploads/4387807/normal_5fb82e23493bd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/levumoduf/aadhaar_card_password_2018.pdf
    • https://uploads.strikinglycdn.com/files/92a3128f-9efb-434f-9b5c-04e91e3668e9/fijuv.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_off0000cbba.bin
aaf5bffcdfac4a60b40a25821230c87871cfcc562d9dc49ff63aa97ae03d2312		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBA 4964 bytes
font_01_sfnt_off0000dc79.bin
466c85ff44a6db732ba616fac764de87fbe34482dab09c5360314747e104639e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC79 9536 bytes

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