Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffdf7576b7b1025e…

MALICIOUS

PDF

71.7 KB Created: 2021-09-27 18:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84497f0175eb04066bce443e98639245 SHA-1: c00f65bb426250a200ced0ca82e169b116683eff SHA-256: ffdf7576b7b1025ebce5199c28c3a3a35242b65884816dbeb6d00267a349cba6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links to other PDFs on potentially disposable domains. The presence of many embedded URLs, some pointing to unknown or potentially malicious domains, supports the phishing and malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://delfosventures.com/userfiles/files/96775006569.pdf In PDF document text
    • https://dzido.pl/userfiles/file/97965682447.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/21985176873.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161502c6b8c53d---pepojuvidafuje.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4943188429.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/44665592033.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/62022520886.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/xajamififamovobum.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/gozeno.pdfIn PDF document text
    • http://castel.lu/userfiles/files/98890750522.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8901a47bc---labomakodumugakenokari.pdfIn PDF document text
    • http://com123.vn/uploads/file/50723118577.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/rixijigeluzezago.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/96259387927.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/letovovugobotogoxukewo.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/zisibajefomozaw.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/fadotopafunasi.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109221105307213.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/52640471761467b05000d8.pdfIn PDF document text
    • http://novafish.it/userfiles/files/10516729744.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/sevux.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/livulapanososis.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/55170374718.pdfIn PDF document text
    • https://servicepapik.ro/files/jafofitolalaxarixir.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/52115662553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=when+does+mha+dub+come+out+season+5PDF 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_off0000b446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB446 17188 bytes
SHA-256: bf6196230bd5c46b8517500d018a07270b3016eaab3951a84b94ccba70a7dfbd
font_01_sfnt_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 10764 bytes
SHA-256: 558cc8fc7207a47ab07c1e06caaa90a88dfd00f4fe510048abfe1815132c7b01
font_02_sfnt_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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