Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78c91cccdfd796a…

MALICIOUS

PDF

75.8 KB Created: 2021-01-15 07:02:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 68d79b965a065c1a90ca0cafd989d882 SHA-1: 775c5eb9f4475e723e69a019ca67a946fa73860e SHA-256: b78c91cccdfd796ac4a1d65976344c0ee147a878582c54f7ddda5246f9c8c638
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains a lure to install a browser extension or update, a common social-engineering tactic. It also hosts a large number of external links, many pointing to disposable hosting, and one URL is identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential theft or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://traffmen.ru/aws?utm_term=ios+12+notification+sound In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_5f975e2d3e8e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451225/normal_5fa4431a0219b.pdfIn PDF document text
    • https://jawiniralegewo.weebly.com/uploads/1/3/4/4/134492986/sesekivojo.pdfIn PDF document text
    • https://rajerese.weebly.com/uploads/1/3/4/3/134387708/kozefijugasekupa.pdfIn PDF document text
    • https://tojaluteder.weebly.com/uploads/1/3/4/3/134384479/fd35210b5fe15.pdfIn PDF document text
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/gibirapiloparepozepa.pdfIn PDF document text
    • https://jowamevo.weebly.com/uploads/1/3/4/5/134511132/6072171.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/bisikepuro_lerezet.pdfIn PDF document text
    • https://tololomajaju.weebly.com/uploads/1/3/4/4/134472688/a84c0ef.pdfIn PDF document text
    • https://tetobalowuw.weebly.com/uploads/1/3/4/5/134523757/rumisajin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fasudikek/13793041360.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/gumevodukudetisatet.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/35070452188.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_off0000eb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB52 5008 bytes
SHA-256: a0d9de54179a30c868ebb8131b27349cbd4b7a49fd974a2dee05caf269deac2a
font_01_sfnt_off0000fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 11008 bytes
SHA-256: 3f7e12cd3d29c59a974b6802e8b4131641235cd86b3a3c88c9716145e846c129

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