Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe34d4709b9883f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 23:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f467fe0ad6ec7529050a015170486e6c SHA-1: 6b14e2409a5758e8fece8a928083ce2e7dc0f7a4 SHA-256: cbe34d4709b9883fa25b12e759445cf6c61a3e3d345be92bc5160101b44db4f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm pattern, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are typical of phishing lures designed to trick users into downloading further malicious content or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=activate+mms+on+android PDF link annotation
    • https://mariellatriolo.it/public/file/kazusexuduvaxo.pdfIn PDF document text
    • http://yjccnc.com/upload/files/wamavewe.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/74809973413.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/rurozawejabodudu.pdfIn PDF document text
    • https://aksusu.com/upload/files/taxekokefigodemasef.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/vabejunuroluwevu.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/waxiragesurugokujap.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/piwebaxigesuligipaja.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/49268486529.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/vejidevunetimoje.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/46056235373.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/5939750685.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/78498841992.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/32617347816.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/xanipifuxivuwuwemozox.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/nifenimidebesojufoj.pdfIn PDF document text
    • http://sergeybazarov.ru/file/67958469296.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/16014971982.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/pizota.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/53805613389.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/jomipenoku.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/2b0312aa9effa754d983a7e6e9a38222/21785177139.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/20747893737.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/jojulexime.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_off0000d877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD877 18388 bytes
SHA-256: 428e0fdc803dc1f0620a9409c5c71deacb86c93562997a01d3ee878228378d22
font_01_sfnt_off00010898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 10532 bytes
SHA-256: fec9d2e9f643d8bdfa63f62fa63d6e1793887b7d6a312565a5ca38ff8f1ae635
font_02_sfnt_off000120a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1