Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6626ff3d384ed7…

MALICIOUS

PDF

60.9 KB Created: 2021-10-11 03:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1409df7dcf70b161d6e35ec9286bf9e3 SHA-1: 109cd2d47ca7c8777af38eeb652f9c17dce17ba3 SHA-256: 3d6626ff3d384ed7813eb1dd905ea3f0db3d3533ecfdc8cecd64b218a7ba9676
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links to external PDF files hosted on various domains. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate that these links are likely part of a phishing or malware distribution scheme. The embedded JavaScript is likely responsible for initiating the download or redirection to these malicious payloads, suggesting an attempt to exploit the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7620

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://modaxch.com/userfiles/files/33319792843.pdf In PDF document text
    • https://srmhomes.com/images/bulk_images/files/28363636269.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/powuwelokuwib.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/7342692997.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/dagiwokofotarubejikukena.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/41818066538.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/40195854802.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/bevemumuxapujulusim.pdfIn PDF document text
    • https://psicologopsicoterapeutaemdrtorino.it/uploads/file/33349656368.pdfIn PDF document text
    • http://strap.sk/uploads/files/88225251731.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/bupupadejojaruxizi.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/6119954061.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/92428496412.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/34013153483.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/22418630943.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/bemiruvinow.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/varibenijenowiruvet.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/xeduleloka.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/pesozudejenijonoduresuza.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/73656001774.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/bipumomutupuzubon.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/61831656334.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5f9c9a1c8---31587973729.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/12181495449.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/dakak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pure+build+osrsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12F 10120 bytes
SHA-256: 3cf81146d3861510023dcf9412d5218d5d07b6d615894da56fdcdc2d347cddaf

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