Malicious PDF — malware analysis report

Static analysis result for SHA-256 de51ec9efb89e817…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 20:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d35938472754723487449a3da8ce6902 SHA-1: 73a0ccde08fcef131931da8d757a8b423e3d6dc8 SHA-256: de51ec9efb89e8175b1dc43413aa35f918adbb9adccf55c5a2af29abea382bff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely leveraging techniques associated with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://queure.ru/uplcv?utm_term=galaxy+s6+screen+size PDF link annotation
    • http://tunesistudio.eu/userfiles/files/gisijukizakupunowebi.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/gazilavonowu.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/80075275330.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/jadutatubekirapabis.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/gojusen.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/81211623830.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/wawirisaboxugapos.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/vejitupower.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/xagofanesedupofezede.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210904141905.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/46055575756.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/rodipewomu.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/nolivoxadiworixizibi.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fccd6d5011---guvadarunaruserafibekagip.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/1316252939.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/bejamevijajovalup.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/53549083706.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/8391070692.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/bosonaxotiruma.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/77347669911.pdfIn PDF document text
    • http://aprt1day.ru/file/merebagibexezesusumatibeg.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/21890672181.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_off0000d2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B6 18584 bytes
SHA-256: 43bd4d5ba7c9be1dcc0d4c652daab69b87b1d64f47b9040c2d8586aede354198
font_01_sfnt_off0001038a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA1 10488 bytes
SHA-256: d05546e87f7c95a0cd23ac1db8e242f3c151a84f7551d20e5c4cc73f2f20854f

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