Malicious PDF — malware analysis report

Static analysis result for SHA-256 940767f0b88e7cb6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-23 00:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a8373c9704a87b2698d455b6d24eec5 SHA-1: e5a301665cf133920e272104ba9dcfa4a3b2facf SHA-256: 940767f0b88e7cb610bb14139f7d1a841745eb636fa6fc8e90f40be07f5b73f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. The presence of these link farms and external URIs suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=android+rtsp+example
    • https://venusnvs.com/userfiles/file/gemagijenifokenapelu.pdf
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/51684195340.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613abb7865413---xokewujopulo.pdf
    • http://piotrkowska77.pl/zdjeciafile/tajoxanofufajabefukat.pdf
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/29485585281.pdf
    • https://cissud.com/uploads/ck_editor/files/fedesufadiwelafus.pdf
    • http://dichvuhangngay.vn/uploads/image/files/66027511986.pdf
    • http://hifitness.hu/userfiles/file/julelinoseketajak.pdf
    • https://suavitinhtannha.net/upload/files/80336213253.pdf
    • https://agriplan-rs.com/dados/ckfinder/files/8209112119.pdf
    • http://rubella2.integra-sh.com/userfiles/file/mojorow.pdf
    • https://soosekszer.hu/upload/files/78921899647.pdf
    • http://autosoftware.company/autoresponders_images/files/mosanurifewavebusosal.pdf
    • http://kochamsushi.pl/UserFiles/file/zoxirofutim.pdf
    • https://marblo.com/app/webroot/img/files/baxulowofeputakasigujigej.pdf
    • http://hasadtemizlik.com/upload/file/69360780025.pdf
    • http://iuoooo.com/filespath/files/20210908180631.pdf
    • http://ph-easycome.com/userfiles/file/sulizukigujubaje.pdf
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/gurabijezapegudojanevafig.pdf
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/kemazovadunuketogofizif.pdf
    • http://studiodispirito.it/userfiles/file/76367562101.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc99.bin
4a4e1b9c0daf15fe812d24b371dc08a2618f8e708f6990656e446d3e1f4bd734		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC99 19192 bytes
font_01_sfnt_off00010ecc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECC 16792 bytes
font_02_sfnt_off000126e3.bin
e8554d4ffc8d225149872ce83d8a58ee5276b0a508f3fec34ddaa671a9c49968		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126E3 10636 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.