Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f84067f7545a2f4…

MALICIOUS

PDF

68.5 KB Created: 2021-01-09 23:29:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9e5b4d5649caa331e90701aa8d4bfa63 SHA-1: 48251faf178fba4e6859c550173dec5e02df8d62 SHA-256: 9f84067f7545a2f4c717bf5d477a6bfae05fbd9ff1441fa8cb70643139d55e22
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, identified as a link farm, directing to external PDF files. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these linked documents.

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
  • 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.
  • 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://traffking.ru/aws?utm_term=google+analytics+for+android+and+ios In PDF document text
    • https://cdn.sqhk.co/powirafawume/evificj/funny_video_download_whatsapp_status_share_chat.pdfIn PDF document text
    • https://cdn.sqhk.co/naritiba/jajRggp/royal_caribbean_christmas_cruise_out_of_galveston.pdfIn PDF document text
    • https://vigelabed.weebly.com/uploads/1/3/4/3/134368569/gezudinazonor_xenalaberis_kisake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490929/normal_5fb7af2c315ad.pdfIn PDF document text
    • https://fiwofufoneronup.weebly.com/uploads/1/3/1/0/131071066/0ac24fcd.pdfIn PDF document text
    • https://vanakiti.weebly.com/uploads/1/3/5/3/135323710/1792233.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427273/normal_5fe136a605144.pdfIn PDF document text
    • https://cdn.sqhk.co/joxomawezu/jfjcTjh/konij.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/gypb4ia/lawivolonaradi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367286/normal_5f87f9604d6f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470841/normal_5fb7ae50e2bd6.pdfIn PDF document text
    • https://cdn.sqhk.co/fejavegiwo/gggc5mx/pocket_veto_vs_absolute_veto.pdfIn PDF document text
    • https://munejubulogulep.weebly.com/uploads/1/3/4/2/134266186/werudizirem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394071/normal_5f947b66e3947.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_off0000ccb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB9 5320 bytes
SHA-256: ed80e6ecc65bc2d53493842b6641d91725fb22a37e3bc922d2b6fcd9069d206d
font_01_sfnt_off0000def1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF1 11280 bytes
SHA-256: 84a82138385d27c5acf54de8dbdf57702a336f75ed17c815fdc85a8f34395cc3

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