Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a7a17fdac2da38…

MALICIOUS

PDF

82.6 KB Created: 2021-09-22 09:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 588cc0296fe0fa461576ec553d05dea9 SHA-1: 4f56eb95fdf14d719b862f2de8db58fe55d7737e SHA-256: 49a7a17fdac2da38d985abaa36f61009a2db2a43090f758f7670f4362c73cba9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a link farm on disposable hosting, with numerous links pointing to PDF files, suggests a phishing or malware distribution scheme. The PDF itself appears to be a lure, disguised as a game download, to entice users to visit a link farm and download further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://tobn56.com/UpFiles/file/dogel.pdf In PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/85331894231.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/xexotekexovaduxerorilepe.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/6284849388.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/14568517909.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/bixeruxogudugis.pdfIn PDF document text
    • http://njchemland.com/upload/files/satefe.pdfIn PDF document text
    • https://maymac.info/userfiles/file/xawekaduguxavimenukaza.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/zelotubabolulufogixer.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/duvadefeloja.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/suwopa.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/xevofu.pdfIn PDF document text
    • http://4rrecycle.com/files/file/77195401947.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/sejuk.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/10035235447.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/79825383250.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/92957359405.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/80588415129.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fe928744a---xubedomuzazozatifakejoro.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/1033464783.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/71810537769.pdfIn PDF document text
    • http://profstil.az/userfiles/file/8985779205.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/46973721705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=download+project+igi+1+for+androidPDF 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_off0000db8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 10896 bytes
SHA-256: 43b67651d14f406fd86a1cae4308a13fc87568a591c4259d859beeaebfcd5773
font_02_sfnt_off00010ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCD 18612 bytes
SHA-256: 1bf923c9fa516cbec5cdf2a276c2d7bc78b2fe6fef2f56cadefa4e0456c74cdb