Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b69bd0e3cef69d…

MALICIOUS

PDF

79.3 KB Created: 2020-11-23 07:31:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dabdbec1cd4349100c05c09f06c253cc SHA-1: 53a7b597ce2ce2c02fcc136b647c1072b6ca2a9a SHA-256: c5b69bd0e3cef69d79d7c29ea3a7a688a6a3d963a233443d22a5ecf79bde4c96
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to redirector infrastructure and a link farm, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest potential exploitation or redirection to malicious content.

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://cctraff.ru/123?utm_term=the+republic+sparknotes+book+6
    • https://wexegupewafux.weebly.com/uploads/1/3/4/4/134443826/3955420.pdf
    • https://cdn-cms.f-static.net/uploads/4371005/normal_5f9273325616c.pdf
    • https://fazolusafiwef.weebly.com/uploads/1/3/4/5/134585025/6668ce6a.pdf
    • https://datirelegewewat.weebly.com/uploads/1/3/4/3/134329883/suxajija.pdf
    • https://cdn-cms.f-static.net/uploads/4407060/normal_5fa548e49aaed.pdf
    • https://kosemarenile.weebly.com/uploads/1/3/4/3/134315061/b9ceffe3a30f8a.pdf
    • https://cdn-cms.f-static.net/uploads/4373504/normal_5f914c8bb426e.pdf
    • https://cdn-cms.f-static.net/uploads/4451575/normal_5fa563af2acee.pdf
    • https://cdn-cms.f-static.net/uploads/4366639/normal_5f88084212525.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2030755d-29ec-42ee-903a-3cf231375ed9/20562834223.pdf
    • https://s3.amazonaws.com/kulinisokakewi/forukusuxixod.pdf
    • https://s3.amazonaws.com/ragejufa/section_3.4_metamorphic_rocks_worksheet_answers.pdf
    • https://s3.amazonaws.com/xurixado/78182275274.pdf
    • https://uploads.strikinglycdn.com/files/bbd6a35a-b93d-44ad-8784-eebe7039cac6/64427603993.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_off0000fa56.bin
4b6f63c28346c29f5dd79dfe6824cd3da75da3af6e175eb9d919fb508782ec41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA56 5328 bytes
font_01_sfnt_off00010c67.bin
57857c4bdf0e57ca4fc548ca539ce6314602eb66a7ec8c68f12e52922cf0a31c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C67 10396 bytes

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