Malicious PDF — malware analysis report

Static analysis result for SHA-256 de61cd890fa91f74…

MALICIOUS

PDF

100.7 KB Created: 2021-05-20 11:39:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b570bda23a97ac9dc8f63cc730762431 SHA-1: 7d52f039f8960fb3cada793f1e4ed5405768d152 SHA-256: de61cd890fa91f7437df8823435ad976cc258fbd05663996a822fe9f8fe26a27
214 Risk Score

Malware Insights

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

This PDF file contains a link farm and a direct link to a known malicious redirector, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded link, 'https://dafemum.ru/strik?utm_term=free+robux+gift+card+generator+2021', is designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dafemum.ru/strik?utm_term=free+robux+gift+card+generator+2021 In PDF document text
    • https://kanexunife.weebly.com/uploads/1/3/2/6/132681916/ludapebuzifaf-safofunaj-tegil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413109/normal_60651b1f26897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375885/normal_606e702226222.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490366/normal_5fccf57d6cd3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371498/normal_605d7b63c62a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444885/normal_5fd624622b6c8.pdfIn PDF document text
    • https://ribovaboj.weebly.com/uploads/1/3/0/7/130775049/5842724.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415334/normal_5ff38bffbe99e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466408/normal_5ffb5a27d4f56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448343/normal_60081e332584b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443824/normal_600f079e7f1cb.pdfIn PDF document text
    • https://romudakon.weebly.com/uploads/1/3/5/3/135318284/1b558a8f17a6b8.pdfIn PDF document text
    • https://ramosekizopozov.weebly.com/uploads/1/3/0/7/130740175/wimutovatukane_ganorigamok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413705/normal_600ea1ee3b8bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411922/normal_604cf13a6ec5c.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/xurixado/36914165289.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/21522577229.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/system_architecture_design_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/vuxofakoxoletififatuxazat.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/what_is_principles_of_design.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/bajudezidulewuvigu.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/jomituzozasen.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/jewuxunun.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_off00014ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB4 5468 bytes
SHA-256: 84815448b0c7c27cd2740a474df9427829fe4ae5a790c3c0d6ef13a10442bafb
font_01_sfnt_off00015d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D70 11900 bytes
SHA-256: c6e97b06a45070caf9d866d5a202aee07bf9d3839649c18c7f0a6e125924e541

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