Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc81bcd826347ef…

MALICIOUS

PDF

79.4 KB Created: 2021-09-14 02:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c6101e8f559d98dce97d779b3304a84a SHA-1: 17ccbba1458ea730c2b14875fb2e64ea044c10cf SHA-256: afc81bcd826347ef61ed8a32ebff8046b9cccc3201197e4ad2d3888b9682d479
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 0.9968

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://smidgel.ru/uplcv?utm_term=how+to+check+keystroke+history+android PDF link annotation
    • http://dlastudenta.org/Upload/file/25799592326.pdfIn PDF document text
    • https://raljob.com/userfiles/file/pufunimedewoxizoxeral.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210912091249.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca7bdc3c19---wasewavowevujozad.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/zenuvevulevosifimideli.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/tilabup.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/roxudurevumusigimi.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/71229742363.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/fewujaze.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/nivanufiju.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/josiniwumevabi.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/94311534461.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/kipagaguwisejinetubuzax.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/99987731846.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613efd7a99481---45714855372.pdfIn PDF document text
    • https://ksboutlet.com/file/files/jutubulejobepebibujife.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210902_E8FA43172E135F87.pdfIn PDF document text
    • http://mastervin.ru/files/file/zimomofujikazufolano.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/povikajibon.pdfIn PDF document text
    • http://autovoda.ru/upload/files/3369914490.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/wekoredetuseweligovul.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/90553110485.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_off0000d2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D2 17616 bytes
SHA-256: 4a74378dc087fb036f5e096432e5643fc9a186165e846a8cf4a5b060c6c2b5e2
font_01_sfnt_off0000ffa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA4 10704 bytes
SHA-256: aec3adefb80e1eaa085c42db593c9e9fd52437e6c5bb124ef735a35fdadd6936
font_02_sfnt_off0001183f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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