Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad8e029c20f0961…

MALICIOUS

PDF

84.1 KB Created: 2021-09-08 15:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 3594dc249e946db8edec8f88e13ce509 SHA-1: 547ba45df99baf05d04af545070ca6700f328ac9 SHA-256: 3ad8e029c20f0961d332ef89fc91777865c49a4f531dd8f8784e246754634e69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.gpaci.org.br/cms/ckfinder/userfiles/files/bisef.pdf In PDF document text
    • http://ricarda-allegra.de/userfiles/file/tetuwufarigewevudipok.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37124960116.pdfIn PDF document text
    • http://parfumland.sk/upl/bajizajakajurolo.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/29830886970.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/61507300921.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/61291755715.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/12496170144.pdfIn PDF document text
    • http://anninh247.info/upload/files/78143529302.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/bebirobova.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/9476128189.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/53864682177.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/4ed7e5577fc332ad2a814f4cdd6dca76/levitivixojelomavep.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210902020634.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/20855971657.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/16992715633.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/92402177771.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/noriganudegagid.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/pudawexefu.pdfIn PDF document text
    • http://edituj.cz/res/file/guliwofokaboju.pdfIn PDF document text
    • https://tckontrola.hr/files/55766789881.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/fitipomunozavum.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/75285676120.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/49285932167.pdfIn PDF document text
    • http://it-hair.com/userfiles/68755670334.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/49570874628.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/lobebevizezixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=jeep+liberty+2010+repair+manualPDF 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_off0000e462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE462 17520 bytes
SHA-256: 8953965878df6dc154c4cf952e681828862899468e1304df07589f6e28c2f59d
font_01_sfnt_off000111a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A1 10764 bytes
SHA-256: a5b793745771530a8c88510dea467a1af4b938375bc122db4c43d79d589a183b
font_02_sfnt_off00012a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1