Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb63c94e7efebdb1…

MALICIOUS

PDF

81.9 KB Created: 2021-09-22 23:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6850e74d5c91b3ba01fa75ab7ab7f5df SHA-1: b4a122163013973d240f67bc94c3da150507b67e SHA-256: eb63c94e7efebdb19addda3e732ab1ed175b3df9b55c46b16f3bd3db7ccc9f77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable domains and are likely used for phishing or to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=watch+channel+7+online PDF link annotation
    • http://bagiez.de/userfiles/file/lodumifa.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/jujudumuvuxutej.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/14338829911.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630735996.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/7234968737.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/23719488570.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/74264013591.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/71518659692.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ae4191491f0f2b4415fac50e5725028/zugevajo.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/97988676256.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/72314450878.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/zafajekupirerejimudod.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/78245172011.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/jexisukimasinikogipe.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/nomiku.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/29306711453.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146971c1b6a9---51661726211.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/wejasukif.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/wubekoganun.pdfIn PDF document text
    • http://grabnerestriche.at/11887498300.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/bazokexisapejesirur.pdfIn PDF document text
    • http://chirineli.com/img/lib/file/gorerejopufavuz.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_off0000dcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E5 18272 bytes
SHA-256: 89176a57de9943314e3000272c6881f3b39a985b5186e0560e2a993f95668a99
font_02_sfnt_off00012448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12448 10100 bytes
SHA-256: 14085a50a7122ff839b103af6f93d1e207a42f012daad13cddadcb6df8feb69c

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