Malicious PDF — malware analysis report

Static analysis result for SHA-256 996dc63d4eb806b8…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 00:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 104f071f86d6ee9dae6e938129001d65 SHA-1: c1506f24724b085f95ec32868cfd6a6fc4b6d211 SHA-256: 996dc63d4eb806b8a322bdcc28d3a0c31172c7a4e10ffe373f8a4fd248ceb3eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to potentially malicious or unknown domains, suggesting an attempt to redirect users to phishing or malware hosting sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://vanlysecurity.vn/vanly/album/files/88572164928.pdf In PDF document text
    • https://108pizza.pl/uploads/userfiles/files/33617538276.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/junifufujutefazoribuvu.pdfIn PDF document text
    • https://coluer.ir/documents/file/misabejesokikurasi.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/41622625788.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/67275133973.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/18241398920.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/635467997.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/tekog.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/5472112297.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/60450871409.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210904203256.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/13571352424.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142643cb1b5f---dulufitonosuxanexalolamuw.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/21156784027.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/wezodafuzogewarogipidixex.pdfIn PDF document text
    • https://rjpexport.com/files/kowekerebagewike.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/rowagobifibafitodexupa.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/61200254138.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/rixepuzav.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/f88e4114524af48903aa449641879bff.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/65114141572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=gta+5+best+drag+carPDF 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_off0000df0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF723 10496 bytes
SHA-256: e67989fba68cd5b32b5cc1b3112f3c2ae8f5df1c0f5fc8c88e754b5fe88daf4f
font_02_sfnt_off00010f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F00 17876 bytes
SHA-256: 8bbdcd404179a87b42b1c8899c8e857ceb621655dc17d631b70739b18917317a

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