Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13765050300dfc6…

MALICIOUS

PDF

72.1 KB Created: 2021-10-04 14:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3781598d3bf48b5189683edc621fc841 SHA-1: 6c581a4523b82d4f3fd3d865051d55239f16336d SHA-256: e13765050300dfc60abcdb7e8f6f2f169ed41114b2353fd26aa4b5a06707e3d8
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, pointing towards a phishing or malware distribution scheme. The embedded URLs lead to a collection of PDF files hosted on various domains, reinforcing the link farm observation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://telorgabus.com/contents/files/37181589749.pdf In PDF document text
    • http://crabandclaw.com/uploads/files/47911311002.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/67732528458.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210914114751.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/40880763461.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/funoxuzasolakegopakeve.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/jemerasuxugodolosotupela.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152bbcb66117---nomumetavuxivinewodaguj.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021910336516434.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/kumozejerujironezidu.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/85324558504.pdfIn PDF document text
    • http://kotolantopeni.cz/file/kanijuroki.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/vinifuwepaziwepi.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/dobakemanivujugelutes.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/wabugasi.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/30/3709191449.pdfIn PDF document text
    • https://roxracing.eu/userfiles/file/pexawuve.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/xajimegorel.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/51462032064.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141819ebcdf3---80567644384.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/xasesulasowawu.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/64562500238.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/pozezufobejevuzisupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=c%23+switch+conditionPDF link annotation
    • 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://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_off0000bb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB93 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804
font_01_sfnt_off0000ce60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE60 17888 bytes
SHA-256: 77c44e1c2c3347738c52d04785c429046cd2a6abc833e16df58c4a6efdfa42f1
font_02_sfnt_off0000fce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1