Malicious PDF — malware analysis report

Static analysis result for SHA-256 0891b55d8388cb06…

MALICIOUS

PDF

66.7 KB Created: 2020-11-17 23:36:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d241e44b417ebf39820d20f317c536a SHA-1: d32c22298e47ba52281021c614cc03c8c8018dc2 SHA-256: 0891b55d8388cb06f99b91fdf8cd931fc3d43fa89e870dd64ec075cef7349ca6
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users 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=baker+furniture+factory+outlet
    • https://zisokilusativ.weebly.com/uploads/1/3/2/3/132303079/sufujomat-mifemepov-zasitobomimegir.pdf
    • https://mijekuwovosi.weebly.com/uploads/1/3/4/3/134321571/tegipis.pdf
    • https://cdn-cms.f-static.net/uploads/4388611/normal_5f9a3a3b5ba8c.pdf
    • https://cdn-cms.f-static.net/uploads/4386073/normal_5fafe04326561.pdf
    • https://cdn-cms.f-static.net/uploads/4376105/normal_5f90848f802c0.pdf
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/6388883.pdf
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/kizerapu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a824f0af-e04d-4a30-aa85-b02cb1b9d20c/64910704453.pdf
    • https://uploads.strikinglycdn.com/files/9fd6b9cb-361f-4f25-9c5b-6ee289e987dc/20222280951.pdf
    • https://uploads.strikinglycdn.com/files/dcb0b891-c7da-4a8c-8536-26d62a02886a/prince_hall_masonic_quiz_book.pdf
    • https://uploads.strikinglycdn.com/files/55dffb21-86d6-42ad-b28f-b5dbabfc459f/dodoxozifisobenos.pdf
    • https://uploads.strikinglycdn.com/files/59a846df-f47d-42b7-9222-b86152fc4391/kebiwoxolugojij.pdf
    • https://uploads.strikinglycdn.com/files/6ebc4036-1596-4814-ad83-0fb3833aa396/sukamopawojukusuvukud.pdf
    • https://uploads.strikinglycdn.com/files/9924c941-4b3f-4de7-a604-cfb37bad8cc2/bolsheviks_definition_1917.pdf
    • https://uploads.strikinglycdn.com/files/8d9c6f60-58d1-4f19-9f39-1a2c2716a119/harpur_academic_advising_email.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_off0000c9c0.bin
96898ae5a912600ffab6c5cfd3b65a7f2b175701a217695220f179ba4a66cf4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C0 4912 bytes
font_01_sfnt_off0000da9a.bin
a4ec50672dec74c0ff5475f5fac260d434bc21d77e477e1819c5bfae24c3a700		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9A 10352 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.