Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c93c0ad78554af…

MALICIOUS

PDF

77.0 KB Created: 2021-09-08 13:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 69bb185995f265223ad66ce9b64736cf SHA-1: f2b2ffd564dd9e6e939e88dae0adfc5a040028a4 SHA-256: 17c93c0ad78554af04f05adf3a10971f10cdba0f0c3e1152926ec87ab273819d
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 0.9840

Heuristics 5

  • 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.
  • 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 http://3mfa.com/images/editor/files/59633756149.pdf In PDF document text
    • http://musicpark-live.com/userfiles/file/8790189896.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/poxonutirexabokojekix.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/15919620007.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109050103451653.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bac2f3d33---gexilanatosusitewedeto.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/kifevenavexemakuw.pdfIn PDF document text
    • https://greengenome.in/admin/userfiles/file/zuwekokijagamuxonakuxoz.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/95462039414.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/96484197866.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613623cf5cf7b---wekemogatipibumeribe.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/tomatukapipijivudidu.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/pomamutewe.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/53945978450.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/56577684304.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/13815990257.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/tojamunekeka.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/tugatedepibebogax.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/14838098298.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/38293645182.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/ranuwidiraforim.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/34401417986.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/tonadejarimemetijaniduzaz.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210903130110.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090204045773499.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/vavatexebojugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=reciprocating+pump+types+pdfPDF 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_off0000c8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FE 11176 bytes
SHA-256: ef56a617d348f6fd8668748d48bc9456d0cb9409c0eebb2c49ee50f4214a1ca1
font_01_sfnt_off0000e2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 16816 bytes
SHA-256: be8cf751f51ce46178381f18f4ab4929608bab49d1228ca60ab759f96e069ca2
font_02_sfnt_off00010e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1