Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cac082cfe3f367a…

MALICIOUS

PDF

76.2 KB Created: 2021-04-07 01:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5bbfa469324693b91ac404a3d02d2d13 SHA-1: fa6c1c6db1c26546e042594f7db4a659f778277e SHA-256: 0cac082cfe3f367a285d7d3ba6ad3254b262fe8ca46f15c0baf4a31fcaf324e2
126 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV and ML classifiers, containing numerous external URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of the PDF being used as a link farm to distribute malicious content or phish users. The presence of external URIs suggests an attempt to redirect the user to potentially harmful websites.

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
  • 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://vilenefex.ru/123?utm_term=elgar+cello+concerto+sheet+music PDF link annotation
    • https://cdn.sqhk.co/woberimi/gg1iaEz/34892896072.pdfIn PDF document text
    • http://ravapusevuj.iblogger.org/xomabudaludupeluveneturel.pdfIn PDF document text
    • https://fogufufizanalu.weebly.com/uploads/1/3/0/8/130813948/2cb3b21bd.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/giagchd/fireman_s_park_elkhart_lake_facebook.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/hdJT782/pazar.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/5vCYgh9/50613054854.pdfIn PDF document text
    • https://cdn.sqhk.co/lowixadoges/Jqjfjbq/t-_mobile_syncup_drive_troubleshooting.pdfIn PDF document text
    • https://bigutorojorat.weebly.com/uploads/1/3/4/3/134352314/wavopix-bazeboluj.pdfIn PDF document text
    • https://kominalekawer.weebly.com/uploads/1/3/1/6/131636772/lumolixarowun-neteseve-luvejupuv-norex.pdfIn PDF document text
    • https://cdn.sqhk.co/solumapidema/ij8jhhg/35986053748.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/958a0eaa-41d1-4f4a-84cf-54b160464020/xefibigitonagafepexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96cb7dbf-3653-400b-a17f-4b303e27607e/41290643812.pdfIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_d3e210efb653409cb60bf2287b4f8ff9.pdf?index=trueIn PDF document text
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_fecc0b3592d048f3b3aa041259ebf057.pdf?index=trueIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_d9aaf6d30bb541069a8acb3b0971ee26.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf8cd847-7738-4994-9367-fceb68d1b1b5/tofen.pdfIn PDF document text
    • https://949217f6-ecfc-4a1b-8806-967b2a145102.filesusr.com/ugd/b08fd2_6b9f076c209f4cbf9180fe54810d7ba4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce88b8a8-262c-4700-96dc-f9417f2e2b46/pirejeko.pdfIn PDF document text
    • http://vizawog.epizy.com/ocean_currents_map.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A4 5172 bytes
SHA-256: c2e6968123dc76eff6117df8d19867ccb37d6baf70661da709f5ca5afaa19d74
font_01_sfnt_off0000e712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 11060 bytes
SHA-256: 10cd2272c54d090bd3824b539b3a21c21df01ece154f2d8325da9f679f085530
font_02_sfnt_off00010cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB6 16096 bytes
SHA-256: 9853a4a918762215dfcba51349555ff48d39e56332efe18e2f333ca30d8a5b61

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