Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a1632801cdceb5…

MALICIOUS

PDF

85.1 KB Created: 2021-09-14 08:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 2f61a01dd8ce2f5262b32b3acd958ede SHA-1: cd8115bda16eb82fe858e205a70f6dd4db7dfb75 SHA-256: f3a1632801cdceb5c5fcda20773c48e2c6bde7579fc345748e8a5b23e82e97d9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://cructi.ru/uplcv?utm_term=apk+quran+indonesia PDF link annotation
    • http://cobansut.com/userfiles/file/77740031962.pdfIn PDF document text
    • https://esvigo.com/upload/files/lawozar.pdfIn PDF document text
    • http://master-br.ru/img/file/41068732994.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210904155313.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/47506053868.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/52698944395.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/54388368125.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/37904686371.pdfIn PDF document text
    • https://cakkue.com/contents/files/67996611791.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/sigebejudiwuditetemowu.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/69710813774.pdfIn PDF document text
    • http://lagrupacio.cat/file/22612350559.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/73264973476.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/wetogawaka.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/tonaluvikan.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191214799518.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50784187330.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/xogubiro.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/64988139165.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/62150554227.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/20399705565.pdfIn PDF document text
    • http://kustari.net/userfiles/file/59022144407.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/1360943111.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/fab15b2767ccdd8234fc932a25ac6101/jideweres.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_off0000e744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE744 18228 bytes
SHA-256: 7f77d5b7b5f7321e4ac84a350f73011699d01f5447e185eb627cdc0d5e9bd823
font_01_sfnt_off000116dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DC 10560 bytes
SHA-256: c9987b3d12bf0fdfda95d762b91052314d2aa908aa2d8e73f7d24c678c17390d
font_02_sfnt_off00012ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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