Malicious PDF — malware analysis report

Static analysis result for SHA-256 e177ea37a52f9685…

MALICIOUS

PDF

71.6 KB Created: 2021-09-18 11:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0cee84eed82c531df3b94cf22c9db69a SHA-1: e8ad454082b0cbfcc2740350befc2ddb082f0e4e SHA-256: e177ea37a52f9685998ec0a19efdddf0e4cd093a5c1a17ff60a3c43c5c611214
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a large number of links to disposable hosts, further supporting the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=8bol+pool+mod+apk
    • http://sial.pl/galeria/file/68600662349.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133b2996cab6---jifejipo.pdf
    • http://kapfenberger-schuetzenverein.at/userfiles/file/jodizedutisirarav.pdf
    • https://calienglish.com/ckfinder/images_store/files/kivobodalin.pdf
    • http://bubb.cn/up_file/file/fifogifagufoxezos.pdf
    • https://songiadahoaian.com/upload/ck/files/taxarorodokimivezen.pdf
    • http://woodlander.sk/grafika/file/mibijomotanefilajizar.pdf
    • http://servmed.net/userfiles/file/fepewikijisakuninitusir.pdf
    • https://faresaldabbous.com/uploads/files/foxuli.pdf
    • http://rsport.eu/yonexshop/static/file/38169854648.pdf
    • http://www.taxivanclass.com/uploads/ckfinder/files/tizuxezukofugo.pdf
    • https://davidfoleyinc.com/userfiles/file/67414676872.pdf
    • http://madinagirls.com/easydo%20v2.00/files/uploads/nedelimubute.pdf
    • http://hotel-ambassador-nice.com/upload/files/57371916897.pdf
    • https://omegaplus.bg/uploads/pages/files/97064834623.pdf
    • http://cncforginghammer.com/d/files/60970048847.pdf
    • http://abwingsmd.com/uploads/files/74670480059.pdf
    • http://canshu.dlzj.net/upload/files/20210904143407374960.pdf
    • https://newcar-rental.com/uploads/files/202109172355337275.pdf
    • https://kovtec.pl/eurostyl/photos/file/96232715266.pdf
    • http://creatinglifeoptions.com/userfiles/files/bosuveworetumuxopoxuroj.pdf
    • http://only-svet.ru/upload/files/bupokuz.pdf
    • http://willowslakerhea.org/userimages/82147561580.pdf
    • http://hamdannepal.com/userfiles/file/48421362287.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_off0000b949.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB949 16792 bytes
font_01_sfnt_off0000d160.bin
30aeeb3029882e0b5ab3386be929f80598ae328caffed819a27aa08899ff89e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD160 10200 bytes
font_02_sfnt_off0000e7f7.bin
ce7ee9668270d45f279000e9be14f9a17b2e6a4927ea0f78bf20aabf24eff08b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 16164 bytes

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