Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c476ef92032b1d…

MALICIOUS

PDF

73.2 KB Created: 2021-09-20 23:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 34612bd7bb291609e91065aa33ff5836 SHA-1: a3bf56ec9f16adf234cad8f49003e4a1eea0ff0b SHA-256: e8c476ef92032b1d343a91dea47a74dae25e9329653a30a016b2f5af2c3f6cc0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to a link farm, as suggested by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of numerous external URLs, some of which are associated with potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://tageedesign.com/ssmpt/documents/file/43757595218.pdf In PDF document text
    • http://cassotech.nl/site/data/ws/files/jazeseduvi.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/fuligadawave.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/sewolefok.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/kagamerozizirife.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/92222595609.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/84344572648.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/zatasosuxapu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf84cb0644---81551939520.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/xasegevel.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/loregoda.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210910232316.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/buxewotufuzemidisivi.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210903_1904ED83DCDE1B6E.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/norevizerovesikele.pdfIn PDF document text
    • https://greenlakecruises.com/ckfinder/userfiles/files/6010118971.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/5738057923.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/mipime.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/lopuje.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/hgdvu53gn156u5eb322lutme63/mefukepotobisofofumo.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/33265298059.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/limimobutotufen.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/xabawinuwerekudagubusosit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=install+iphone+on+androidPDF 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_off0000ba58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26F 10440 bytes
SHA-256: 96d336953e99903a50af2d43c70db4098c44442f7cdfdd10da94425288d2ed3b
font_02_sfnt_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 17560 bytes
SHA-256: a2e2ff64d26578cb44827321c9fa2a311b2232e2321dc575ee3879d357d5bdf6

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