Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c32d345e877fe22…

MALICIOUS

PDF

80.8 KB Created: 2021-09-08 21:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0debbd84927d8c34c7498d982c90e6f5 SHA-1: 0193f9e614f7af1d99185a25057be2f749e12caa SHA-256: 5c32d345e877fe2276326604356b2ac41dcaf1d400d40dff2be295e512d7bb8a
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The ML classifier strongly flagged this sample as malicious. The embedded JavaScript likely facilitates the redirection to external URLs, as indicated by the PDF_URI and EMBEDDED_URL heuristics, potentially leading to phishing or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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.
  • 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://highlander-inn.com/assets/userfiles/files/kadomapigezotewal.pdf In PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/darovidaxetuxibetif.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/98405186854.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/sabazafazorisimutafaxoxe.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/mubumigobofaparomuporaw.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/3727034456.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/69045246187.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/tazutozariwes.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/48498631753.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/00bhnm196epmu2plmagrvqs90q/lozikigu.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/gitibugemerekakidiwej.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/98516919702.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/nifabiliv.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/26312601549.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zafavifererorenifinisote.pdfIn PDF document text
    • http://hidramaco.com/files/files/wudotizokupufogobaletid.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/labonimavav.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/jixuvazunesodudo.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/zekedowodoponifawesinebab.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/42740023396.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/28601530962.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/55912447764.pdfIn PDF document text
    • https://spacio.hk/attachment/file/zuwageviwereru.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/vujofimim.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0046bad3b---8041120631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=brown+bear+brown+bear+what+do+you+see+activities+pdfPDF 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_off0000d536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD536 17688 bytes
SHA-256: c23664b7afd47766f4d0faa07cae98b9126d770b32674ddc4f1893f376adc2fe
font_01_sfnt_off00010337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4E 11228 bytes
SHA-256: c0aabf4c48a6dbd014ed88a3921dac4680fddffe4c4f098416d69deccbe9ba50