Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e211a9c895b0268…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 05:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12d01bd39349229b39714b750686e5b8 SHA-1: a00c3ccf1b038e864587e4104037af3eea97d190 SHA-256: 0e211a9c895b026866c33c9f38290dd787bdc8e551c83e1e6c73cf6ef365263c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_RANDOM_URL_LINK heuristic suggest the document is designed to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pistant.ru/uplcv?utm_term=canada+spousal+sponsorship+forum
    • http://sintjorisparochie.nl/userfiles/file/juwijajizevimi.pdf
    • http://novehorizonty.sk/userfiles/file/27314997649.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec4a25b93b---lasuzisefulavewof.pdf
    • http://sinocelltech.com/filespath/files/20210904133320.pdf
    • http://ambulatorioveterinariocigliano.com/userfiles/files/katokazawid.pdf
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/fiwipedenumodavurobimug.pdf
    • https://tekdalyapi.com/upload/ckfinder/files/84016163727.pdf
    • https://responsible-tourism-alliance.com/content_file/files/sufunade.pdf
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/67594481301.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/bovexujaruvatixurerumaba.pdf
    • http://theclelandgroup.com/img/upload/file/4101983418.pdf
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/15065694852.pdf
    • http://asea-admin.com/_userfiles/file/20210905183359.pdf
    • https://czus-lukasa.sk/userfiles/file/temox.pdf
    • http://coreaad.com/DreamDataUpload/file/70053585941.pdf
    • https://halkum.rs/files/87391407279.pdf
    • http://uniroll.pl/user_images/file/93366087956.pdf
    • http://sten.kr/club/data/userfiles/file/20210912210258.pdf
    • http://benthanhsgfarm.net/images/uploads/files/xogekig.pdf
    • http://ffarchitettura.it/userfiles/files/98045802712.pdf
    • https://heks-tech.com/app/webroot/userfiles/files/95860168300.pdf
    • http://diagnosticaedilizia.com/userfiles/files/fofimuwukavi.pdf
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210911064240.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8A 16792 bytes
font_01_sfnt_off0000f2a1.bin
236f137163b58419a6f8c3cb601469dcd29851c72ac11677893a9a928e7c0511		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 10664 bytes
font_02_sfnt_off00010abb.bin
2ba7f6eb9a0c6832f3d39cc3b20f403f6a7b2847641a6897da2c545c1cc0fe48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 17656 bytes

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