Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1d5973ee6db5d3…

MALICIOUS

PDF

74.7 KB Created: 2021-09-15 15:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1678cde3a260bc716f5d9c6866a6902a SHA-1: 9c03263819ef06df86c4b52fea11346509dcf7c8 SHA-256: 6f1d5973ee6db5d3ee722609002b0ea7096ff9c40a769074bc88bee4d795286a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffe0a166a5---kiwasa.pdf In PDF document text
    • https://5703n1n6999-6a55.com/contents/files/84733824498.pdfIn PDF document text
    • https://maisonforville.be/documents/file/dojubuvenugiva.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/zavasapiwomejikiwiw.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/kanuruxox.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/jabiwidujunu.pdfIn PDF document text
    • https://bawauang.com/contents/files/vigunut.pdfIn PDF document text
    • http://mrybalko.ru/files/xujek.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/sowuwudixudikamikom.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/81572067808.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/19218990715.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/susogujujajibuwavibov.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210909164934.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/88197108431.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/xusiliwuv.pdfIn PDF document text
    • https://soechi.id/userfiles/file/vazagezakam.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/45233480321.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/50a31d093f875f40ef1581bacdf57815/35559824314.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/lumifejixafijakegigewozi.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/podimijirijajinufusedebu.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/zufuzibuvulolobi.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/jenovimewavin.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/1752605205.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/ziravo.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/40246748424.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/kizidejulaxudoneb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=miui+12+miui+optimizationPDF 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_off0000c1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 10292 bytes
SHA-256: a4610e59bb704697079a46534f211f3499e1c106236226e06c7ef23aad186444
font_02_sfnt_off0000f10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 16996 bytes
SHA-256: fb1fa10e5b86819c9e46648f14ce19a4ebd57b93085735a3d04578acc0fdba48