Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc90a2dcda00ddac…

MALICIOUS

PDF

80.6 KB Created: 2021-09-11 02:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2fea1af6bcf5462c366458ca5ddfb614 SHA-1: d5f1582783bb97f72eee67658d0fc8250367ff52 SHA-256: fc90a2dcda00ddaccfea4c74cecbb78b8964d2162dc94dff5ae14b1ae4802743
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies the pattern of using many distinct, disposable hosts for links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://jr-bang.com/uploadfiles/20210910121822.pdf In PDF document text
    • https://hsse.cl/files/lozit.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/neromebaramegijorogofirib.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/fefigetufutuxajokoneg.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b11fc3797---fufixedumekag.pdfIn PDF document text
    • https://upaspor.com/resimler/files/momamikijan.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/94323731468.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/14477130467.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/dirapugiji.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210906180509.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/18824017197.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/ef3b2908e0ee49a9113161f9bac6365b.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/jaxinotigaxamubapikigodun.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/15698902799.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/37248185619.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/98050887151.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/dijofipowav.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/ragasefunirumivodak.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/faxepedelev.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/jutuval.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/7249362188.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/gujavuzuvofufunowego.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/galabawiwalugosumegixo.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/13820878013.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3a1ed2495---24726723855.pdfIn PDF document text
    • https://cargotavio.ru/files/file/sokonerozagoruzujuzaneron.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+banner+saga+apk+downloadPDF 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_off0000d62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62D 17848 bytes
SHA-256: 562a2f1e8ee5b1720927e8b9cbb989b38beeb55070750a1c9d124b8179336496
font_01_sfnt_off000103f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C10 10760 bytes
SHA-256: 312d8c0ecd31d962135d2b0bef3a00df117fc68c4d1f53365b099ca8a6678da6