Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8de43ade3b8a0a9…

MALICIOUS

PDF

69.5 KB Created: 2020-12-17 20:33:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c9b6f3c8c9af5534678ece48a17187a7 SHA-1: 772c5fd744629a907c19789c9bdd21d92c2ea0bf SHA-256: d8de43ade3b8a0a9f8ba809e63677fac5f32aebd66fa4f6a67966d789c0d1b15
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The embedded links, such as 'https://cctraff.ru/123?utm_term=sonora+webster+carver+and+husband', suggest an attempt to redirect users to phishing or malware hosting sites. The presence of a link farm further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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=sonora+webster+carver+and+husband In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379038/normal_5f912ae771f53.pdfIn PDF document text
    • https://jegolufu.weebly.com/uploads/1/3/4/6/134677495/kotutowuwalulod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e91be327-9d4c-4493-9e09-d4aedead824a/28063437430.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8773ea0d-a5a5-4c72-bbc6-4773da21eed6/45354299159.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a1f9d6-4e14-4ce0-a396-fec5105086f4/o-town_where_are_they_now.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0a89c7afe470b5582a6d/1606224522672/vokobawujelaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/566e1d13-9884-419e-a49a-e81869d651ac/ugly_american_temporada_1_espaol_latino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2171da21-b3e6-40d9-aa5a-94b040210e56/sazubuzegiwibowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9f44075-d032-41bc-becb-7b1711e2a3c0/26953669508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a6d7b0d-8086-4aa0-befc-c5473f4432b6/88615641957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0ce72e8-1fa8-461c-ad8b-2e3c1386c0fd/star_wars_essential_guide_to_warfare.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_off0000d23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23D 5388 bytes
SHA-256: 642c9a91414e5cdc340cd1e8adbbe080554d089c9f4a17cbeb9d91acd6e77981
font_01_sfnt_off0000e49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49D 10944 bytes
SHA-256: 9f6201d076363dd8bc27d8a9d36805729d2ad7dcd503ba448161c7bf5aa1d0a5

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