Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08797ff941881a6…

MALICIOUS

PDF

74.1 KB Created: 2021-09-14 22:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b54fa8a0ec9e725c785222ed6f3690ab SHA-1: 4473db8ea6d6bac04776d3f25780c7da6181e8ad SHA-256: f08797ff941881a62b3ea34e8877d1834c011ef18baa2258d7e67dc66f0d75cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with one heuristic identifying it as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=remove+noise+from+video+android PDF link annotation
    • https://rainbowprinter.com/app/webroot/files/file/wujuxaberolasexolebojal.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/xunuvirowemolazezagoduf.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021090410561273499.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/86996512827.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43931360272.pdfIn PDF document text
    • http://firegallery.ru/img/upload/nafilirev.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/15853528060.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/wavivunizafukadavos.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/mexobefiluxaduwawalitikus.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/zoderiz.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5eb91f0b---fuvabanifexavovilufolige.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135baa7a3d20---notinijutuvawoxeke.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/pisulamupenokenutepasi.pdfIn PDF document text
    • https://hgb.se/filer/file/17389318693.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-2/20210902010901645153.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/safatamap.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/fiterebibovosem.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210913_233141.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/libisubaboduzenovolune.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/sifarozikedelajimi.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/168039091461334ac25d95e.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/zezuxabis.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/lazibekakisedasuva.pdfIn PDF document text
    • http://beiks.info/public/file/xesegule.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_off0000bd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD98 10484 bytes
SHA-256: d6bb964edf31b7f047cbfb4e782f81acd480868d89a79b4ff3272f1dfdcb30b3
font_01_sfnt_off0000d569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD569 17560 bytes
SHA-256: 38fa6cc0261459626ec441383d826c14da1fbe8f86635840e5b8f0e26e77ec34
font_02_sfnt_off00010314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1