Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ffe5fb8d7b2508…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 17:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fad3961a793a73965fa9c2a5ec9d0404 SHA-1: 29919c9f8d28b14a627af8584c4df1f875517acf SHA-256: 65ffe5fb8d7b25081c46bb119403fefee8b8071ef5ffacf8b3365603f183d835
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to 'coretry.ru' with a query parameter suggesting an Office 365 lure, strongly suggests a phishing or credential harvesting attempt. The heuristic 'SE_URGENCY_LURE' further supports this by indicating the document contains language designed to prompt immediate user action, likely to click on one of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/uplcv?utm_term=office+365+tls+smtp
    • http://auburn-properties.com/userfiles/files/sijabeterug.pdf
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/20496010975.pdf
    • http://vinaktv.com/storage/ckfinder/files/nevimedadeliz.pdf
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/69243354537.pdf
    • http://mobil-tech.com/files/rulozegopanefogov.pdf
    • https://n-zvuk.ru/upload/file/diloxenino.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8845eea67---54227269332.pdf
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/tubobex.pdf
    • http://thecuriosityshot.com/kubat.pdf
    • http://rdmsrl.it/userfiles/files/regavofagubovatusisowaf.pdf
    • http://ngocphuocjsc.com/public/default/ckeditor/files/97423896300.pdf
    • https://indirimlipin.com/calisma2/files/uploads/zarudejokuzon.pdf
    • http://i-daa-wl.de/userfiles/23709963198.pdf
    • http://damnoen.com/ckfinder/pho/files/86669361705.pdf
    • http://ipoz.pl/userfiles/file/nowodikomividufesogoj.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398440d1362---nezabixi.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210913220124.pdf
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/lolatunibirozirojenon.pdf
    • https://zivotzaokny.eu/res/file/nududodozovezuvalivuduj.pdf
    • https://bloc-immo.com/images/15769855693.pdf
    • http://123podkrovie.sk/editor_uploads/files/sanipozemu.pdf
    • http://ticketsperiodico.com/galeria/files/73127167304.pdf
    • http://mwbright.com/upload_fck/file/2021-9-14/20210914103737749664.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EE 16792 bytes
font_01_sfnt_off0000ef05.bin
c50b6e105579d0b5faa70b723ee212b60ed8246329b3f05ed3616eee5b37731a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 10652 bytes
font_02_sfnt_off0001077c.bin
0bdd84c951d248134ca6030db3f8ebaecf508651ccc084fcb55f9b06708df3db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 17044 bytes

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