Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3a99354804bff8…

MALICIOUS

PDF

69.7 KB Created: 2021-09-17 10:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 554629496001f018461c35401cc533ea SHA-1: 32ca5c916bbb8a48a3c54028191d1ec33ef1770f SHA-256: 7f3a99354804bff8ea3d8717eae667a8954c53439f1f2b43230b498b23f250e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a campaign to distribute malicious content or phish users. The presence of UTM parameters in some URLs suggests tracking and potentially targeted distribution.

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://cructi.ru/uplcv?utm_term=unlimited+coins+subway+surfers+ios PDF link annotation
    • http://malabarisproducoes.com/arquivos/files/topijuv.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/nujazepixave.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/xedenolaxijazajalosufuxi.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c58712499---fobanemuxiz.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/3648289714.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/beninirazo.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/xubomulelitas.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/fewemobozikajafove.pdfIn PDF document text
    • https://songhong.info/userfiles/file/xijibudoxelefagaxono.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fed8b47d0f---jasabesisufasevoxolo.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/2150253479.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/66789574841.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/gaxixarenu.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/9515181381.pdfIn PDF document text
    • http://myesen.life/userfiles/file/49627773346.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/jixinasagidasivarik.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/xapefukesatezexaj.pdfIn PDF document text
    • http://honghuibio.com/d/files/xodunadadefomivusus.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57369176631.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/rirafuwewejusiveto.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/madopa.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/kanaxedifebawimi.pdfIn PDF document text
    • https://www.znackakvality.info/files/90222263104.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_off0000affc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFC 15652 bytes
SHA-256: 4d876d05c0bc859df08ef5e257db064ee9b8cdc3072c58cb4e13eb13e0a80bbc
font_01_sfnt_off0000d78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA2 11084 bytes
SHA-256: 68b2ec454e7ac321eaddabfeb851ab0780636862ec6d6c4ccae0879485bd43c1