Malicious PDF — malware analysis report

Static analysis result for SHA-256 de046c8a1eec437d…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 06:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 34303ecfc544439d862bf8534be094d7 SHA-1: ad4cdd63d8386430c77e9ce60763cb136a9f98b8 SHA-256: de046c8a1eec437dfe931e584a047ab17bb53c633cbb9af700fa6a7803d9b8ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=new+super+mario+bros+u+deluxe+download+rom PDF link annotation
    • http://www.prodomasa.com/ckfinder/userfiles/files/surakotipazavo.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/koxogekalejuzurixarid.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/67092567741.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/27311257083.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de153c5ffa---5760508871.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/72776841462.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bexurevowojaxosi.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/90286101251.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/bubinevol.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/81667598871.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/zavavatejajorotil.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/804d8d8747c384a745f2fcd65fe67edb/figiwumifewapitigowuw.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/43259472305.pdfIn PDF document text
    • https://icbacademy.com/upload/files/39213459070.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/ribexagikevugofima.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/18975668117.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/sonatazuwi.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/97451781997.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/dafevurozukidoraretazi.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/96923739494.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/febuledalamixaxini.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210901203058_wxzz7u.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://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_off0000aee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE5 10860 bytes
SHA-256: 2ae2c9e96aa1dc5bc36c6031d8e1bac38c78f0786865d958349dd8cb936a2a2b
font_01_sfnt_off0000c7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C2 17892 bytes
SHA-256: af5fbc4a946a4bf9b6ee6424842358c35fee57735b2f631b9789e297f0cdfcc3
font_02_sfnt_off0000f662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1