Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef42f25cef49a3f8…

MALICIOUS

PDF

75.4 KB Created: 2021-09-18 12:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7c93c79b473b547214ec637b470cf253 SHA-1: 4daf707eb62c7e0171a7a3ce577e54b3c12ddcbf SHA-256: ef42f25cef49a3f8333a1dc490220c57313a816b33bda4fd96d476a268e5edd2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many pointing to disposable domains, consistent with a link farm used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://horkolas-gatlas.hu/ufiles/file/33987296054.pdf In PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1631233514.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/77198447586.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/guzitaxu.pdfIn PDF document text
    • http://dakmet.pl/upload/gelunufizuzetazupulagipan.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/20741896462.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/75588053770.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/nubuxowavizepupawuzukukim.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/97462901313.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/94818239165.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/49145913868.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/lujikuvejeditob.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/6612302738.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/xuzuzutolepuzigeritax.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44809145269.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/zizosuf.pdfIn PDF document text
    • http://ktcz.eu/files/files/dumizuwuwosiwafik.pdfIn PDF document text
    • https://bliznacite.com/files/zoxexodutenipiz.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16130b4a464e46---kutozekupemoruvipomi.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/64217467616.pdfIn PDF document text
    • https://trieurodata.ro/images/file/31375039132.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161394d7d95228---sijebosuwijudajapujepat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=resident+evil+for+android+mod+apkPDF 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_off0000c21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21D 10864 bytes
SHA-256: 772eb298d6ba3ab3a45a4bfa22832d05ee0fe2e42ba90e5bc2dd23b0be1ddb45
font_01_sfnt_off0000db36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF348 17304 bytes
SHA-256: 77a4d4f3a66dc7039bf18044a6b3ea0828d6ecd5d23c8a760caf0dea7d5567bf

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