Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af58e755bcb3ecd…

MALICIOUS

PDF

72.8 KB Created: 2021-09-19 15:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e067e48028482d0785a4c54d0320a350 SHA-1: 950af7ecbe1e5f8a2f085cc1498ef2a7c8e4a1de SHA-256: 2af58e755bcb3ecd03b6c6438c2112ac92cd1a4a4b51426fcdf3e65ac3a99a09
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://chinatupai.com/web/js/ckfinder/userfiles/files/xinojenelazosejekerizijuw.pdf In PDF document text
    • http://fecirturizm.com/resimler/files/berozagumupakutapom.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/41001530996.pdfIn PDF document text
    • http://askaudit.ru/price/43096130971.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-1/20210901103019561542.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/gekobakudi.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/jugeled.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25022366327.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/takizodezanijoj.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/xogomorakudoxeref.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sepewodomanaledu.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/bipamarirakigulumituror.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a46206714c---15873000274.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/xaguzotugibogopizut.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/timojexojipebo.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/xexitudeliwavakeviteja.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/pelepafelulawexa.pdfIn PDF document text
    • https://akvaguru.hu/user/file/dulufemimokijim.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/kawunirodepawe.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/30791452494.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/86575454452.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/fudof.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///tugever.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/28046026787.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/gotiramupatazuzituxuxezeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=football+strike+mod+apk+android+1PDF 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_off0000ba8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8E 10816 bytes
SHA-256: c6c2ba6e3e03cc4b6f9c897e91b6a9d9a7d542d7dbe1547242405cfea6a1423d
font_01_sfnt_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5C 16288 bytes
SHA-256: 225fb58a0879fa7b1d617c2881cf06dfb664285263d3906983be73c6114943f3