Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c562099b2bc1f18…

MALICIOUS

PDF

84.4 KB Created: 2021-09-18 22:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b296a2d6e8670e2a0804f09bfbfd6506 SHA-1: a4bf31bda0403ca1051f5a5d272aab49bca80afb SHA-256: 6c562099b2bc1f182aefff4b233beb6e3b3a680b54db7e356a91f56230df411e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm, likely to redirect users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The embedded JavaScript likely serves to download and execute a second-stage payload or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ky-auto.com/uploadfile/files/duvejedalejenede.pdf In PDF document text
    • https://rafaellopezehijo.com/upload/files/tekuvelutujefezo.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/64851084044.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/nenaxifo.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210901195409.pdfIn PDF document text
    • https://ismart99.net/upload/files/55953180097.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/25773722475.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/58133971776.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613701d24bd39---70752609225.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/94574677414.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/vemarukemiwoxinekafatu.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/tubuzolisugafavon.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/favovizaseputupobopefun.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/39m09q2tose7l3i2q2bh43clcc/fugologukebep.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/13036350302.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/18193549715.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631958649.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/wetonawobuxubutoxo.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/3659318606.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/98408693706.pdfIn PDF document text
    • https://finliz.lt/i/File/tupixebotofed.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/gozazezubinoximufolo.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/pibasi.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/47345266743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=movie+dont+breathePDF 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_off0000e361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE361 19008 bytes
SHA-256: bc0128c4904df9f690dab826909131e7d36714cf0a4343208cf5df18a44e4273
font_01_sfnt_off000114af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AF 10332 bytes
SHA-256: a4dadf406ccaa9136319159f7993e098ae4ce0e5a2988cb665993fd8126d2145
font_02_sfnt_off00012be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1