Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa0c9f2de961f45…

MALICIOUS

PDF

75.4 KB Created: 2021-09-21 11:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 394965ba15b8bd757d82363edd3c82e3 SHA-1: a5d2cc27796b7204feba20dcb5428aee0df17f9d SHA-256: ffa0c9f2de961f45d8c03ed22b5c02a4d56f06811c03558a25f7873d59ab728d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links for SEO manipulation or to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://huntic.ru/uplcv?utm_term=awesome+tanks+hacked
    • https://hsdinstruments.nl/uploads/files/3204963677.pdf
    • http://osteriailgalloelinnamorata.com/userfiles/files/tumirixudexodusenolat.pdf
    • https://zd-zeta.com/uploads/files/202109031633248144.pdf
    • http://www.kymenhome-etsinta.net/tiedostot/files/viwipuvat.pdf
    • https://dveropolis.ru/upload_picture/14187352557.pdf
    • http://ptaki.info/imgekoprojekty/files/fuzunirumasitokebida.pdf
    • http://pataibicaj.hu/userfiles/file/renowebinofuxewegujepe.pdf
    • http://photopuzzle.net/userData/board/file/82508192980.pdf
    • http://tdsns.ru/userfiles/file/77414055132.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f45425b01---3181321889.pdf
    • http://ltptech.vn/uploads/userfiles/file/fosodoxefokeverole.pdf
    • https://cooperadora.grupocreartel.com/documentos/archivos/83865094064.pdf
    • http://designklasse.de/ckfinder/userfiles/files/lirajore.pdf
    • http://tgtech-auto.com/userfiles/file/kokirupedajaxamika.pdf
    • http://otvorene-srdce.sk/userfiles/file/xerome.pdf
    • http://krupongs.com/images/file/telofu.pdf
    • http://gniortho.com/files/Upload/file/pogulo.pdf
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/63628058759.pdf
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/diwafepivasoka.pdf
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/190215066069.pdf
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/51856223800.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_off0000c257.bin
5d124c373c3abff5464c307a8e394ebd0ee19d7b955066182d7a4c62d3b64239		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC257 10556 bytes
font_01_sfnt_off0000da55.bin
1f2d9f8f0e0b4afa187edc7b632bc6c647dc2b60d01989ac1436c71afdbdf3ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA55 17528 bytes
font_02_sfnt_off0001081f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 16792 bytes

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