Malicious PDF — malware analysis report

Static analysis result for SHA-256 2feea33751ee69e8…

MALICIOUS

PDF

79.1 KB Created: 2020-12-23 23:18:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2638a645d3a49fe863b8a774070ae730 SHA-1: b4c8974e3a46c87d0387e93ec98251b2ae3c48a6 SHA-256: 2feea33751ee69e8025de9f77e28f43fa83ad969f85a367dfb7450ac011df565
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or link farms. The primary malicious URL identified is https://cctraff.ru/strik?utm_term=woodcutting+osrs+guide, which is used to redirect users to further malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=woodcutting+osrs+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_5fd7d4aedc7a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490133/normal_5fcdc81517814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452389/normal_5fd63f7a4f70c.pdfIn PDF document text
    • https://vupimolafi.weebly.com/uploads/1/3/1/3/131398504/147665.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381098/normal_5fcab381a9e30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404725/normal_5fe2d2a57e900.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369318/normal_5fe3591c8adf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484355/normal_5fb00388a329a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407085/normal_5fe200b38dd71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_5f88a39a59875.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372972/normal_5fdd5f540e8ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367622/normal_5fc73289cabbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376606/normal_5f8a6b247d32e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375514/normal_5fc53d33b5f15.pdfIn PDF document text
    • https://wudizabilizone.weebly.com/uploads/1/3/4/7/134745746/xugasudijujini_duzizeto.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/2ac39df3-22c7-4ace-93ba-f51a4da9a46b/i_love_myself_book.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_off0000fa15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA15 4876 bytes
SHA-256: e13947730b38353a3191d6e10e5c1f18f08deab54da832d0dcbec120c25eb1f3
font_01_sfnt_off00010acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACD 10796 bytes
SHA-256: 4b51a97824a940683067d59aceec5a57ae3c96c7fa609c7e4bbe8a568799ee1e

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