Malicious PDF — malware analysis report

Static analysis result for SHA-256 923b924f24e02373…

MALICIOUS

PDF

79.7 KB Created: 2021-04-08 16:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f8ec26bd2a4661000f40b3ac17e3d6f0 SHA-1: 364824ee80b282cd4da474ef1536f4aaf2752628 SHA-256: 923b924f24e02373bf62d427b2cf8d548a05a426530bc6d88cb0fd8782d1bec6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://seumenha.ru/strik?utm_term=ryobi+router+table+mounting+plate PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454164/normal_604a8eb367ebe.pdfIn PDF document text
    • http://xenojupu.mywebcommunity.org/define_ethical_leadership.pdfIn PDF document text
    • https://kusajigoma.weebly.com/uploads/1/3/6/0/136036420/3059202.pdfIn PDF document text
    • http://xefawojuj.mygamesonline.org/9475411005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486537/normal_603a8c94c0240.pdfIn PDF document text
    • https://benadegerabo.weebly.com/uploads/1/3/0/8/130874398/2904389.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413456/normal_5ff3d6371f746.pdfIn PDF document text
    • https://fudegenajeno.weebly.com/uploads/1/3/4/5/134581691/9597275.pdfIn PDF document text
    • https://xobiduri.weebly.com/uploads/1/3/1/4/131437628/3068932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474985/normal_604b57ee914d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428334/normal_602f5f6a76906.pdfIn PDF document text
    • https://xesanojazal.weebly.com/uploads/1/3/0/9/130968931/bimokapiv-zowuluw-rofenejogipe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_f63e8b07705e452d86b8b92798a3c3eb.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_d40500eb764f43999533d3e30f9c934f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/citizenship_article_5_to_11.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/who_was_vano_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/34361053397.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/96484124840.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_off0000fd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5E 5212 bytes
SHA-256: e5ce52b1801490af9f2ae68216b127c2cb2c2b781b0b02dc83643af15d033f90
font_01_sfnt_off00010f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F13 10036 bytes
SHA-256: a32a02cfb35676663ef97fd4c55f04ba69d73a5bc671367676b66c54b16c0f79

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