Malicious PDF — malware analysis report

Static analysis result for SHA-256 71dbb02e2739293c…

MALICIOUS

PDF

71.2 KB Created: 2021-09-15 19:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5cb861a3fbf5b5e28d9589d418e10d95 SHA-1: 414e01c59fbce93b2a68e8e8a81b60da0f18f042 SHA-256: 71dbb02e2739293c6b62ba93d2ffb427ac12a95a707717d284edd5e18c897f99
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to external files, suggesting a role in distributing further malicious content or phishing attempts. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports its use in a link-farming or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://xboxheerlen.nl/userfiles/file/xetakixodovanew.pdf In PDF document text
    • http://wdnederland.nl/file/85598660740.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/rewatitono.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/pesilukowasupa.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/88240596242.pdfIn PDF document text
    • http://vodnik48.ru/content/file/31859228647.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/zexevenelagadelupizubume.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/78404682169.pdfIn PDF document text
    • https://magerp.org/upload/files/19013153144.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/38096859648.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/vawejufomagazamev.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/32992662556.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/velozuwufurobijifopegu.pdfIn PDF document text
    • http://ebus.cn/up_file/file/kosapifebu.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/58448049007.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/c5df143a5827a766052bbbee8c912412/gosano.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161409d247d5f4---49726359722.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/kelilesedazubifirulanidev.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/topuvupufovanudotu.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/39064037095.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/82118686841.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/18508383058.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/31391077457.pdfIn PDF document text
    • http://esipro.be/userfiles/file/notukofitetuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=brawl+stars+cheats+downloadPDF 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_off0000b7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFED 10512 bytes
SHA-256: 3f4d3da21210eb250592181cd8dce250fba92f5afcef86377d3a215cf76e65be
font_02_sfnt_off0000e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 15340 bytes
SHA-256: 8df21b031f9ccb4d04d0eb685ea58b729c96ffa3f0b48e5463b6f2d4b3d7253a

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