Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ed109464606b36…

MALICIOUS

PDF

86.9 KB Created: 2021-09-18 13:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d2db96c94640331225f19df6323099eb SHA-1: 562185b12709cd1eb28c03fb88ea597affe8cb59 SHA-256: c5ed109464606b367a6ac5a9b06f2a52d05781024bd95333575efe05921caf9d
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs point to various PDF files, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it's part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/91274060375.pdf In PDF document text
    • http://synowka.pl/galeria/file/didoriguzopesoluw.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/92210277090.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/gazomazewaxexax.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/1236294055.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/90008319694.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d54a0642b1---53787644087.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/xozowoton.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/neson.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/48165887630.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/dobupakugosiwimepezejaweb.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/bajipewavo.pdfIn PDF document text
    • http://congluc.com/upload/files/99649316096.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/robizoritenubufegeruxo.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/jirok.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/6cad66492258d26f4d182da076f2812d/dexogididova.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/70987145271.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/94884330903.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/bilakipegupavabegisot.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/vikevunep.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210902203900227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=best+android+games+for+3+year+oldsPDF 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_off0000f14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 11036 bytes
SHA-256: 96cb6bbf5a98dd6da110763e8a05cb33ec4c858c17ad9446b96b7141a01a1076
font_02_sfnt_off000122ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EF 16572 bytes
SHA-256: e8a97b824cff686dfc09c106ecec05e048eb1ad3f3f0b218ca6dd8224cecd9a2

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