Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dfb4dd768a426dd…

MALICIOUS

PDF

81.7 KB Created: 2021-05-06 11:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ef60c407e02ec4bdb2e88c6b87094b6 SHA-1: 2c5df667c056166d2366d6228aa41268e40a56e8 SHA-256: 6dfb4dd768a426dda1fb634afbad166ef11d540528a69661bb756f5b60633376
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and the presence of external links suggest it's designed to lead the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=50+to+1+fuel+mix+chart+litres
    • http://filmera.ru/lujobijupivewoluduwajuh2w5z.pdf
    • http://gotiwekiz.iblogger.org/modutuga.pdf
    • http://kumazekewenow.22web.org/94890217272.pdf
    • https://static.s123-cdn-static.com/uploads/4459636/normal_5fe50dc06dc2c.pdf
    • https://cdn-cms.f-static.net/uploads/4377116/normal_6052b12c14321.pdf
    • https://cdn-cms.f-static.net/uploads/4372085/normal_6034f9544145f.pdf
    • https://cdn-cms.f-static.net/uploads/4376866/normal_606045aba3bb9.pdf
    • https://cdn-cms.f-static.net/uploads/4365642/normal_605494edd988e.pdf
    • http://cabinetshq.xyz/skyscan_atomic_clock_manual_28600pvyah.pdf
    • https://cdn-cms.f-static.net/uploads/4368950/normal_60432ef77c756.pdf
    • https://cdn-cms.f-static.net/uploads/4413011/normal_605ff1f096755.pdf
    • http://vizilamu.22web.org/ligezapawawuj.pdf
    • http://halfraire.xyz/57895143979cdm54.pdf
    • http://saburogamo.iblogger.org/73284050920.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://89e38ec3-4f9a-4901-8333-056bfd5bbc5c.filesusr.com/ugd/3df7a3_c3decb6d5bf64848940197c3fec825ea.pdf?index=true
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_1b50b584dd7846668f3ec7409ce2f522.pdf?index=true
    • http://domidezoraz.epizy.com/nyne_bass_pro_wont_charge.pdf
    • http://ganofebaleto.rf.gd/how_to_stop_culligan_water_softener_from_regenerating.pdf
    • http://dotejujuzobok.rf.gd/bizeruti.pdf
    • https://921790ca-7b53-43bd-a25d-275d6f056404.filesusr.com/ugd/9d24cb_f5ac62f361384bfba7bf073f1ac277e4.pdf?index=true
    • http://depebovibu.epizy.com/35617278355.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010029.bin
17702d225c085b449b8a8db8a8a5c95d5a266af33a51bd8b9b05ce8952b07656		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10029 5412 bytes
font_01_sfnt_off00011277.bin
429d2f1c54e989ea8fff812e2769a7394cd6ec19ddea130962df92fbfb5c790b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11277 10968 bytes

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