Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eab44ec1e9b2938…

MALICIOUS

PDF

66.5 KB Created: 2021-09-22 17:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1bfa97470c70cb5bbcb72f0532eeaab4 SHA-1: 774943edb39c62b4c9cacd693e8d43d5f3cbbed7 SHA-256: 4eab44ec1e9b2938ef94a4970e90f7eeb0940ccfb89b685ae601119ad67db1cd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a phishing lure due to its small size and image-heavy content, suggesting it's designed to trick users into clicking external links. The document body is heavily obfuscated, but the presence of numerous external URIs, many hosted on disposable domains, strongly indicates a phishing or malware distribution attempt. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5460

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://allytemp.ru/uplcv?utm_term=mcdougal+littell+algebra+2+answers+pdf
    • http://wsp.pl/userfiles/file/bijaxiduposofi.pdf
    • http://prplus4u.com/ckupload/files/fukarenu.pdf
    • http://carsonpokebar.com/uploads/files/voduwiwefino.pdf
    • https://gionggiacam.com/ckfinder/userfiles/files/popawajiva.pdf
    • http://deltools.com/userfiles/file/ziguvidalorudux.pdf
    • https://successalpha.team/upload/files/bifisizenir.pdf
    • http://goodlife88.com/uploads/files/42364091333.pdf
    • http://wjcopy.com/upload/files/65245873504.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/94768296465.pdf
    • http://tl-maskinfabrik.dk/userfiles/file/zusumuzojunanujede.pdf
    • https://highlander-inn.com/assets/userfiles/files/munafopabiwit.pdf
    • https://stoneappeal.in/FCKeditor/file/lumadimur.pdf
    • http://jandebruijn.com/uploadimages/files/62672634632.pdf
    • https://cultureresortpokhara.com/assets/userfiles/files/83748510224.pdf
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/lawitekeravokuxonetef.pdf
    • http://vinczeandlaszlo.com/upload/pabupabole.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/tevodujapevirubixinura.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613aea11f0024---fodogefik.pdf
    • http://pitchdecor-construction.com/user_img/files/waxotajube.pdf
    • https://krossi.ru/images/content/files/26562676034.pdf
    • http://kustari.net/userfiles/file/nuvexilafesufak.pdf
    • http://ihdbd.org/upload/files/xepewej.pdf
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/dejosedojovirumu.pdf
    • https://rotterdampools.com/contents/files/wovudimed.pdf
    • http://zussobrance.sk/grafika/dokumenty/36712103355.pdf

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