Malicious PDF — malware analysis report

Static analysis result for SHA-256 164df950f9cf0e0b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 02:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2303e3dc898fab80f0e43f0b699bbeae SHA-1: 69438f78f32127af69bd25221a51b7eca225ce2a SHA-256: 164df950f9cf0e0bc3fc121b8e79a652cd19decd749d5071b79928996799cf67
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=movies+2016+online PDF link annotation
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/dd50f66dacddbf49ad8cbb59618e8ea5/50818028420.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614046c43c415---pafosejepurerilutokoman.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/82379589731.pdfIn PDF document text
    • https://krossi.ru/images/content/files/26562676034.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/xesin.pdfIn PDF document text
    • http://askort.pl/Upload/file/lekikinupoga.pdfIn PDF document text
    • http://packturf.fr/files/vunozelixosufomu.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/94639979441.pdfIn PDF document text
    • http://www.agot.pl/upload/file/dejirobov.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/56743686070.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/medemuboguli.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/5227862249.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/73262688964.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/gemeromonuvaxavatiguke.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/84053180021.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/vutuxumo.pdfIn PDF document text
    • http://karczma-zaborow.pl/userfiles/file/retafiponidirunisewusuz.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/rapimazimujaluzifoponu.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/gaduvuxetepibobalovaxilov.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/navezosilezovalir.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/worususibivusuwo.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/ruwajetajiba.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/86770797302.pdfIn PDF document text
    • http://unityproductions.com/upload/files/mizofezufixavupovoju.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/16283190742.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/68189765599.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_off0000db3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 10264 bytes
SHA-256: f56e88e2d5cbfaaffbc564afe79d60f66e923a8f395a42215173175d431457a7
font_02_sfnt_off00010a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9B 17272 bytes
SHA-256: 24f3e34360f06beb318a5bc26a370a12884f27bd0929b09f9bdc00761a9f0e00