Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca88167b9d11cc5…

MALICIOUS

PDF

85.5 KB Created: 2021-09-10 14:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 627202aae7891bfe000b6202cb5028ef SHA-1: 5855eec5e5b11bc23abd0c6714bea383f0a2cbf2 SHA-256: 2ca88167b9d11cc5fb1db0684e9402ee600070fed6e5a068e853e6122d162f04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a pattern of using disposable hosting for a large number of links, suggesting a malicious intent to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 5

  • 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.
  • 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://chambres-hotes-aube-bleue.fr/userfiles/file/22710641443.pdf In PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/lozom.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/mapukemobubutogegos.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/97902842491.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/masafifi.pdfIn PDF document text
    • https://wmu24.ru/media/file/85035039685.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/88917888828.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210905054925.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/xokirozefomozune.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/23817803362.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/96590800574.pdfIn PDF document text
    • http://asid.rw/userfiles/file/84987337792.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/fupulujozib.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/18320536281.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/60286664187.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/jexinekifejile.pdfIn PDF document text
    • http://podushka.by/files/files/zalarapasememopetodifodow.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/tagotekipodexamujadok.pdfIn PDF document text
    • https://tmtteks.com/files/24174990288.pdfIn PDF document text
    • http://farmina.ru/uploads/files/81317543761.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/58907837378.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/fibapajeradigudozokajuvi.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/17441480685.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3c98db7cd---96218654152.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/mibobirejevisumiridoditez.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/lamidirufawavi.pdfIn PDF document text
    • https://tadimtursu.com/image/files/wosakebolenef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=g+stomper+studio+mod+apkPDF 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_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 18564 bytes
SHA-256: ef42126cdc3d706890b78e32113f615455572798821708d34a3ac09fdddfbb06
font_01_sfnt_off00011780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11780 10632 bytes
SHA-256: 0a6d3c12c46b575451f26b8b83ef21aa402c52d4e0d12746795aca3833f7b236
font_02_sfnt_off00012fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1