Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f0b1bfef4f0b15…

MALICIOUS

PDF

77.6 KB Created: 2021-09-14 08:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 96f6315bb68223dda0d5f4d31a976d76 SHA-1: 4d6bdf7509b4152b564a2b6a574d6966c08b2900 SHA-256: e3f0b1bfef4f0b15ddd7e13fceabfdbf1e8b85de938b9f2f2fc13dee8ae3c86e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution campaign. The PDF structure and the presence of external URIs indicate an attempt to redirect users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://allytemp.ru/uplcv?utm_term=can+you+transfer+app+data+from+android+to+iphone PDF link annotation
    • http://zjgyuanhong.com/v15/Upload/file/20219132057408528.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/20046007369.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/dopewigebigi.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/kupobitixax.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/7681005845.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/90619503670.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/96197816318.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/liwusupot.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210913141246.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/ladijepixif.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613123a6ce37a.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/9222235960.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/mutozinamozowigomu.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/furete.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613de51ea170a---29840711309.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/94317751427.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/55301239897.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/28619894275.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/28989328266.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/20409127671.pdfIn PDF document text
    • 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_off0000ca69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE280 10964 bytes
SHA-256: 2de45b8a64257c8ceeca05223caed8dbc99299fd828f8da512632a011a271998
font_02_sfnt_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 17284 bytes
SHA-256: 23bc5e54ea0a0876618727137a28d44cc3b7f01aee403d1ddd9947886afa1300

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