Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0dddbf4142a540…

MALICIOUS

PDF

77.6 KB Created: 2021-09-12 17:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 338688973357d10eefcefdb27ec4dab8 SHA-1: 159cb3b2a76dede5aa26ac34a6a20aa283f266a3 SHA-256: cd0dddbf4142a5409cf710dcfd890276553136e546e7d59c2239fe2eba621cd9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user or initiating a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://jjsgreatescape.com/uploaded_files/userfiles/files/9812330459.pdf In PDF document text
    • https://rakowka.pl/userfiles/file/93465703756.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/budigogasakatag.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/23452723412.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/pitokijavorar.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/dudoj.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/864693995.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/9596357889.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/vukulos.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/54380757610.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210831233119.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/24043148205.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/54033814664.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/vojivukobebuvu.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/52262609378.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/25393423224.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/regogowunepufiji.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/dejapimozepufaxisemodat.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/vavokugip.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/dazagipovakefikibopusumul.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/scjuuk1pdr8g5oilmjvsj28ga2/24447142878.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/0ln60tg096j5e007u6boq2gbnv/luregelezedot.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/zufuwaxewopoluvelesimib.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/medijadamexesakev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+check+stored+password+in+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_off0000ca2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2E 17836 bytes
SHA-256: 54c630cfbad467d86f905c2b307f8904e7ab7d8e7882fd97fdf71ea51101390a
font_01_sfnt_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001105e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105E 10732 bytes
SHA-256: e8aecf15006d5cba55c291c16c1812ae2b537855572bf75563fa29c9eade7ae7