Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6c6f763b73ebcb…

MALICIOUS

PDF

83.5 KB Created: 2021-09-09 20:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: efb83cd3a09b72e407465a393bfe8f42 SHA-1: 6f7dcaf479e70a8670e833ff6ecd2b97bf32b3c2 SHA-256: 2a6c6f763b73ebcb8477c2576e4d84b8209c8005707ab9ac50a7e441f47ed1e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://archism.ru/uplcv?utm_term=quick+heal+total+security+for+android+mobile+free+download PDF link annotation
    • http://gfb.it/upload/fck/file/82490772095.pdfIn PDF document text
    • http://lovesenergy.com/file/26175123481.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/rofiwefezaweb.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/14154473595.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210909_2EAE0E63BC8EA092.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/8017801516.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/33413523075.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/pogalojuzara.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/38711329297.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/rumugosozoxilitid.pdfIn PDF document text
    • https://j26clean.com/upload/files/kewadapugilibirisu.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/xixedogofotonafatiputuj.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210903_220527.pdfIn PDF document text
    • http://zamgph.com/uploads/file/061508028056.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/somabixorig.pdfIn PDF document text
    • https://paradigma.bg/uf/file/nufatelekotamep.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90634290402.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358f1240f9d---23598523628.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161313b0a86104---virarejolagexubiwifunoni.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/62785519803.pdfIn PDF document text
    • https://il-gusto.com/images/file/jezenijafupuxijun.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_off0000e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 16572 bytes
SHA-256: a76a15c226e56e7852a5a0d9d2e44f1b8d2df0c1712ec9a4e595e5278052f5c0
font_01_sfnt_off00010d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D39 11332 bytes
SHA-256: a0b4c9e4530d7a520612c783171f600dc94e5d841e606d410ff699699ea1cff0
font_02_sfnt_off000127e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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