Malicious PDF — malware analysis report

Static analysis result for SHA-256 34122dae80ebbc08…

MALICIOUS

PDF

71.5 KB Created: 2021-09-19 17:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da57838db548cd14aa92a8e79d90fa89 SHA-1: 3ae5f0cfbfe0074c52ffff9ca72e18e69234c7bd SHA-256: 34122dae80ebbc08a0ed59cb23c9dd0f0c6fa3efabd02e9e5dca188382c2b7ba
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further payloads. The presence of JavaScript points to its use in facilitating the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bzws.zhanyougame.com/ckfinder/userfiles/files/70634620994.pdf
    • http://stavebnevyrobky.sk/www/upload/files/budidugamuxoruxeb.pdf
    • http://wonikquartz.com/upload/editor/file/1630663519.pdf
    • http://vibratingsieve.com/d/files/zololifulirigivevapaziwo.pdf
    • http://boxshop.mn/userfiles/files/vixemoloxizemefow.pdf
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/wobukovawumemapogana.pdf
    • http://zenkatsu.dk/files/32744771409.pdf
    • http://vibestedu.com/_UploadFile/Images/file/62035327624.pdf
    • http://hueide.com/upload/files/roxigaduv.pdf
    • http://byecook.com/ckupload/files/14571798740.pdf
    • http://bfcy88.com/uploads/files/2177729655.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/89821974627.pdf
    • http://bio-scan.com/userfiles/file/30628054955.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9lsna99dv1geu387fct5ltpn27/57483860357.pdf
    • http://songpinhao.com/userfiles/files/98246298865.pdf
    • http://misr-consult.com/userfiles/file/zelizajujonabo.pdf
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/fajotuzigodutezeba.pdf
    • http://mrs-edu.com/sribati/editor/uploadfiles/nawedijafejixefoziwunemi.pdf
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/ziponevozudesa.pdf
    • http://sinsg.com/files/fckeditor/file/29105144111.pdf
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/nagasunasarobiz.pdf
    • http://abogadosaguilar.com/ckfinder/userfiles/files/rekirifaso.pdf
    • http://administratieindex.nl/images/uploads/dufosovuvemefuruzaper.pdf
    • https://educationindiajournal.org/ckfinder/userfiles/files/jilibawiropo.pdf
    • http://www.valathors.com/ckfinder/userfiles/files/nafavukexe.pdf
    • http://datcat.vn/2018/file/67562567983.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fifa+20+mod+fifa+19+apk+obb+download
    • 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_off0000b66e.bin
9fc5ac129f0e655794f9701c76e4e4e48e537cba5d4010c27b982dbd07e2cf2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB66E 15932 bytes
font_01_sfnt_off0000df96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 16792 bytes
font_02_sfnt_off0000f7ad.bin
510345f07b270a9c347a4a1032c087daee3066f903fc848527c4c75a65dcaff0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AD 10916 bytes

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