Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54c0c65133c7e50…

MALICIOUS

PDF

82.6 KB Created: 2021-09-15 11:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8894e31e462b43c280d7348c72fabb97 SHA-1: d263607287a5a0e08e4e16089bf56b409af61721 SHA-256: d54c0c65133c7e50372c107e042b8729e910f16d21afdd2a0f499a88fabf0bc8
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, and the PDF contains numerous embedded URLs, many of which are hosted on suspicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to obscure the true destination or purpose of these links. No scripts were extracted, but the sheer volume and nature of the URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 4

  • 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://brianhaymore.com/images/e/file/25680462955.pdf In PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/ligubobevobivo.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/71078827465.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/50660936658.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/17905281081.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wamazajakixulesat.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/vikabadanu.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/lolaw.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021932328374667.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/varolusozadozufeji.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/c547b2f731f3b9c1e2deaef3c718a5b7/kirumulaxibubozuf.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/dobulukodetulexof.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/makumarowujoxoritow.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/lewebalemuri.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141379f71998---vipimirulopojar.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/92629342097.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/banizifexutejesoti.pdfIn PDF document text
    • https://iohrp.org/f_files/files/34890167988.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/jozusevejepojetufo.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/nipujajaxe.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/dipimavoka.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/98332890174.pdfIn PDF document text
    • http://mgrima.com/files/file/nazuwodedojegemeti.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/79666561381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+i+set+my+ringtonePDF 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_off0000e18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18A 16920 bytes
SHA-256: 8d41feac3ca5bfddd39ca2487180b902ab626558b599f9ff2d524a33fc902df4
font_01_sfnt_off00010d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12541 10572 bytes
SHA-256: bc638e81956de4492fe03acea2a555ab74dd11e9b1a63b73e7a8844069060c1c