Malicious PDF — malware analysis report

Static analysis result for SHA-256 c624e4798257a4af…

MALICIOUS

PDF

67.9 KB Created: 2021-09-19 22:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8f4320f8088368bf7c22577d4579e598 SHA-1: e143d79511b8dafb57917f103fe787efd959f0c4 SHA-256: c624e4798257a4af1f38f2fb3ec5f368f71ff358d8e63bd1e39e16d9e32e65c3
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many hosted on disposable domains, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9159

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://philabc.ru/uplcv?utm_term=secret+screen+recorder+apk PDF link annotation
    • http://ambvetsanprospero.eu/userfiles/files/tototogiviwawikuti.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210908_60193.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161478036dd50b---4578007383.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/wilaf.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/62499318815.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/regegotanebofike.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/93226945342.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/1242463191.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210909172844370505w1rb5y.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/82814244437.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/tarisuvujotiloz.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/tikaje.pdfIn PDF document text
    • http://mextro.de/upload/files/4486676591.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/tatovuzoz.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/ruzobinomogifowuw.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9521380960.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/77829410420.pdfIn PDF document text
    • https://rippa.pt/files/file/41192707133.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bf7339ff8---kaluvidoxenaxupovagu.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/37873482142.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/4876292897.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/veritagizaxeveguxikison.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/82777230913.pdfIn PDF document text
    • 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_off0000df47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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