Malicious PDF — malware analysis report

Static analysis result for SHA-256 e675f21eab8aa7ba…

MALICIOUS

PDF

88.5 KB Created: 2021-09-08 23:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d981c872fe203a711788ccc2f7ee9075 SHA-1: 45751c87213961d61cd96fb1d132324dce80a9fd SHA-256: e675f21eab8aa7ba99f0a19ea0492aae2a25e8a0d7f5b9089b213aa9a0415aed
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates an attempt to execute code, likely to facilitate further malicious actions or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130222484290---2788583248.pdf In PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210907224958.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26032966494.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/36410782917.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/pugamubami.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/76615398478.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/87882992555.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/suvalero.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/13966794569.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///vadunewoxi.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/54292428084.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5bd59f50---bawolafawoluv.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/wipabowemugadawodonol.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/13448489596.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/77895687982.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/2557994090.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/mupaxar.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/8773466719.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/fepukujubulatoduxoxeli.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/tepejolule.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/kegimovunovitow.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/34817787263.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/deradokunekusik.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/56744033497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=fm+whatsapp+messenger+latest+versionPDF 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_off0000f5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A0 10828 bytes
SHA-256: c54980c2d4fef0cbcec0cca0bd8cc68d80b0de99477f2824196d7afec0bb1c3b
font_01_sfnt_off00010e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6E 17740 bytes
SHA-256: be689fbb39c64fd965a8c0068f139709f785dd33d15ac8217204ef4d380e1f5b
font_02_sfnt_off00013c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1