Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad64a1e86c957778…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 14:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2ac3408938f4d61962c45e7e9feff0cc SHA-1: fd241ac36e91f0a5eb4f076be7b0ec612cde79d1 SHA-256: ad64a1e86c957778201a54f7332b651e9c7d6759f9642dbb4d445da43d73a640
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for initiating the redirection or exploiting vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://smidgel.ru/uplcv?utm_term=pucked+helena+hunting+read+online PDF link annotation
    • http://www.ondebiz.com/userfiles/file/14481835034.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/fegamubivodatiza.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/35514795174.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/detevimonarutejugonugovel.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/54580439068.pdfIn PDF document text
    • http://yjccnc.com/upload/files/93317262553.pdfIn PDF document text
    • https://fong-cai.com/upload/files/gojixegimepitovizavubadud.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/11299446458.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/nowidupel.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/32991295214.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/e2d5f76d57ce8ab561fd2bc5b4c7746e.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/vunugeja.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090512471670554.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/taturagafigoguzatavuxu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614afc50364fd---tiditalofuxu.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210904_010617.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/61474216024.pdfIn PDF document text
    • https://mauspro.net/upload/files/rurawajotokig.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/puwisabisegabulux.pdfIn PDF document text
    • http://bwc.lt/i/71177625011.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/matikaboreg.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/53452242263.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/81540028385.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/gigokavunama.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/95593643714.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/5b2bddd37f787e7b27b1ce6590fa6980/vaduwubupid.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_off0000b177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC989 15660 bytes
SHA-256: 0094c396439574c8bcb54688dddf9f8e5a7bb7d4c9aba6f289a8aae1c3233a7f
font_02_sfnt_off0000f132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF132 10672 bytes
SHA-256: 358c346d7375bb2afc52398fb04916c140bb4894e8e3bf7aadecd18f4f64da45