Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b6d6f8f80ca605…

MALICIOUS

PDF

69.5 KB Created: 2021-09-27 18:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cf708c0131119ee7c62fd617378c7132 SHA-1: 10ec9ae378b053696ac2a32237f672f3ee6ffc7c SHA-256: 03b6d6f8f80ca60561f7013c143c042d1098076dc086ba02937890a679139650
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, suggesting a link farm or content distribution network. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious campaign, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://csn-alliance.com/data/files/favudaxonarapeguxe.pdf In PDF document text
    • http://vtvxm.vn/userfiles/file/xazupefab.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/wakaf.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/6464494521.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/dozilarenakamuwipuxef.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e725f6a42a---97967268554.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/senedemozomadeweku.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/zawalasugibexosaxoxufup.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/12988221818.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091408054073499.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/japopajen.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/wofekivejifesofa.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/g7ooqhlfedf09sga9ktutuabj4/83512179723.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/gorerufadusanalamogope.pdfIn PDF document text
    • http://www.celso.org/download/kepelerifob.pdfIn PDF document text
    • http://citty.org/images/uploads/file/karamevirekem.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/sozezifarikogig.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/20712532883.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/72244784275.pdfIn PDF document text
    • http://nakajima-ya.com/user_data/image/file/pefanogikij.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/61834666530.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/dapegudajuzomoxikoreg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=stickman+war+battlePDF 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_off0000ae22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE22 10496 bytes
SHA-256: b4714833370467cd877a01e3723ea480d238e6def403720248c2c5bbf799cc1e
font_01_sfnt_off0000c60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE20 16784 bytes
SHA-256: 575b3f4fe3a5b40a3cb94edb2c297fa3e5269dc9169615da19cb197314b54fd5

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