Malicious PDF — malware analysis report

Static analysis result for SHA-256 33bae34074567207…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 13:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 56cfbd2f8e1636ad1c5bb4c1fea121e2 SHA-1: f9bd407b2f7597f80ed6637441d69aeca0b44c92 SHA-256: 33bae34074567207cef0ef36e27de5bd4c1597f5cd419c52f03641c393da9766
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URIs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for credential harvesting or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=genshin+impact+unlimited+primogems PDF link annotation
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/24300819136.pdfIn PDF document text
    • https://empresa-venta.hr/files/4701864038.pdfIn PDF document text
    • https://t2sc.me/userfiles/vobupesifod.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/51140040403.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/nubujotivatizikadega.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/12157586848.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/faveropipetaduzotuxodix.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/94290597017.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/23936541110.pdfIn PDF document text
    • http://moristas.com/userfiles/files/wanavutozusunilagogoxem.pdfIn PDF document text
    • http://sayarbobinaj.com/file/35476165534.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/fadimukabunu.pdfIn PDF document text
    • http://wwstationery.com/files/file/zimovavoxibedidaguxabetij.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/zeribowabupisabobipeval.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a5707532c4306120d7f7454bfbdfaf73/kaburexofuzopuvawipa.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210907014235.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/virob.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/tisaderim.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/xubafanejiruvoboboluxuwej.pdfIn PDF document text
    • http://goldmustang.ru/files/files/kuwakowiduzovozegasiwig.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/luxokafugotovikewow.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/sexevaputetewowefipoju.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/54888151174.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_off0000e08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08E 17792 bytes
SHA-256: e60b04350f81f2ed1f75e60f6051b345625d0bf5a63c2cc11db17aae7872bdb0
font_01_sfnt_off00010ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC6 11100 bytes
SHA-256: 391e4eac9af99ab28d91a8728c01b9fce2c9c6c5235b49cbb42810790d27f2d6
font_02_sfnt_off00012843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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