Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e75a9ab3573087…

MALICIOUS

PDF

84.9 KB Created: 2021-09-13 23:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17b3eff6e85869d38381356ab657baa7 SHA-1: c00672dcb593b6d661d45136f141aa44f5282862 SHA-256: 45e75a9ab3573087affc3e3e7e22674b6727e45108b0d68e18e9fe046609b605
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to potentially malicious or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://alasclub.gr/neuro/ckfinder/userfiles/files/xanobimotilupovebukos.pdf In PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/pagikapamewivikoxed.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/97028036857.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/77822512685.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/61126181091.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/bozokelumefegifo.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/10870111457.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/vesevefimefiv.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/xetezujep.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/jiforidupurepajuxe.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/112303355718.pdfIn PDF document text
    • https://theurbanthinktank.com/files/vuraburanidavutitilulewu.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/xidaruginap.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/zaledinibisutotorotis.pdfIn PDF document text
    • https://defi128.com/userfiles/files/95922143488.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202108311905372170.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/ea9bba4329cccfa1dba69ce82eafbeef/wedelorinoki.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/pabatepibukavinilofesopaf.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/39409546489.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7cddedd87---90770006922.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/69311742050.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/zuzisobarujazitojewut.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/subelefifado.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/fusujadepora.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/pibuwejinodinowisanotor.pdfIn PDF document text
    • https://latework.cz/soubory/geberemesazejop.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/19690109668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=watch+wonder+woman+1984+online+free+no+sign+upPDF 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_off0000e2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A5 18124 bytes
SHA-256: aff90e4f27b4dddd7a0dc71f9aa7e9949bb37a8ba6dcb75f26bf47a588fd9a90
font_01_sfnt_off00011170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12987 11752 bytes
SHA-256: c38e901738bf0a19ed03f5587baa36626a19aa43e85cbf2690f14f2247eacaa7