Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada5045917513110…

MALICIOUS

PDF

76.9 KB Created: 2021-05-20 21:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b2e973548aba70c7768bcb777dbf4fc7 SHA-1: 223c65a4150a74cb22a6506fd6c0e55c01a031fd SHA-256: ada5045917513110eae2ad54e7fc492128c119eba782221a3212c2635655060e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains including 'jacksth.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure suggests it's designed to redirect users to potentially harmful content.

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
  • 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.
  • 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://jacksth.ru/strik?utm_term=is+aesthetic+only+visual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417807/normal_60241c15c4d1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457620/normal_5ff7c46ea709e.pdfIn PDF document text
    • https://dujisiseruw.weebly.com/uploads/1/3/0/7/130776106/e192f3429980c0.pdfIn PDF document text
    • https://fujuzelos.weebly.com/uploads/1/3/1/3/131380065/627067.pdfIn PDF document text
    • https://budamasut.weebly.com/uploads/1/3/4/9/134903336/fatowogasekapifuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425005/normal_60208a0e5538d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475204/normal_5ffa86b3d6b24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478664/normal_5fd331c193186.pdfIn PDF document text
    • https://dawoxojukuput.weebly.com/uploads/1/3/4/8/134890950/9d550c2bfe471.pdfIn PDF document text
    • https://kodepifaz.weebly.com/uploads/1/3/4/7/134705681/62b86.pdfIn PDF document text
    • https://babobulelemin.weebly.com/uploads/1/3/5/3/135344535/478176.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/tunenijexe/physics_for_scientists_and_engineers_tipler_5th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/wenivekovarojovotebojawo.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/online_mandated_reporter_training_missouri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b27bd2e0-2ce6-43ed-9f9e-582b65668270/simixasozuguxose.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/how_to_repair_kenmore_water_softener.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb1e7150-7007-4be2-a5db-7e8233ee8732/how_to_connect_backbeat_fit_headphones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1fb9628-4c88-4a2e-a2ff-a46ab5cf6868/32212427243.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/10257495753.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/linunutozaw.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_off0000edf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 4888 bytes
SHA-256: ddc57aa0b04a6dc0b03a047931d313c12143c0ccc6f709d8b2a3135e5e8d88d1
font_01_sfnt_off0000fea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA4 12108 bytes
SHA-256: 39b6144788f6c4af102c22bef2d0a92cd0f77d0f335d600a8c2ea481dec99371

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