Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ecaa7dff4e8ce54…

MALICIOUS

PDF

40.0 KB Created: 2021-10-05 17:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6f07317279795ded69ddbb73f71673a5 SHA-1: 18172ec093d30a6afe980b2e53e2dd8cd3bc95f9 SHA-256: 9ecaa7dff4e8ce54c622540f14c49198268e65daeeaccb205e4e9a1d4a722e3a
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external PDFs hosted on various domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_IMAGE_LURE' suggests the document is designed to look like a screenshot, prompting users to click a link. The presence of numerous algorithmically generated URLs and the ML classifier's high confidence score further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8966

Heuristics 7

  • 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.
  • 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 40 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://wastran.ru/uplcv?utm_term=narcissist+and+triangulation PDF link annotation
    • http://transchem-tech.com/Uploadfiles/files/lekuxemerok.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/devarovitixatapozexegezap.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/64423605511.pdfIn PDF document text
    • https://esvigo.com/upload/files/84229933550.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/jenox.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/jepem.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/2a8a3d6a4817e991ce85e5325e107109/29253026683.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/21905239233.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210919092548_n8tgo6.pdfIn PDF document text
    • http://maytinhnangdong.com/files/uploads/editor/files/62607105713.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/rikofuren.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vewepajosixafovasesiloro.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/54937411339.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/nakupuniko.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/69792043527.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/jimakaropumagaj.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/23997324717.pdfIn PDF document text
    • https://chsromania.managenet.ro/images/file/17319016658.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/45602155824.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/61515692580.pdfIn PDF document text
    • http://linker-apps.com/files/vekusufujitub.pdfIn PDF document text

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