Malicious PDF — malware analysis report

Static analysis result for SHA-256 f48308f13623900a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 23:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1d40c3e7ee4436da6e38b5c9034e264c SHA-1: 0af1099efb8f1cbae5410c2a3cc550f23f005de3 SHA-256: f48308f13623900ae5f15959ca3cdb37c6cfcf7751381a08510f94dc8e91cf62
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to obscure the true destination. The presence of a visual download button and the ML classifier's high confidence score suggest a malicious intent to trick users into downloading further payloads or visiting phishing sites. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://architettosbaffo.com/userfiles/files/lobinategapizozarowajuru.pdf In PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614167cee5813---zafetaruvafad.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210914164917.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/7624344474.pdfIn PDF document text
    • https://spacio.hk/attachment/file/sagovijazivelulevemewi.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/20713837251.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/rejavi.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/pemuxeririkadozo.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/48280732204.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/80129399528.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613765c97ae4f---36041767994.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/56773229408.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/xikugebevawirugev.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/kudugowe.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/sebejomurejiputuwarudipa.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/veritivakixenoniki.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/raxikeridumoburuxelufap.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/jupobirejejufe.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/wutuzuxalagorasow.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/wilirawulevavovujupe.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/fidenawizojomomeziwuxoget.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/votuxagufiru.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/4845616097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=chrome+to+tv+castPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/bepotujevusabujo.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_off0000d7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C6 10348 bytes
SHA-256: bbbc3a0f883a560b16bd4246a0ba6f0c3f2a997ded9559892e5e2102a35bf1c2
font_01_sfnt_off0000ef44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 17892 bytes
SHA-256: 62118dbb02663db5748a3e261ebbc8de72c6db0ba028071aef04a96cda6fe360
font_02_sfnt_off00011dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1