Malicious PDF — malware analysis report

Static analysis result for SHA-256 2230ba014db2e40c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 03:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c938711bb8273486e9c116b65270c37a SHA-1: f636286503898820fc11718106ee091b63e56553 SHA-256: 2230ba014db2e40c1ee5d909be8bce1b066f06c417d1d30bb610f0fc85926ab7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to other PDF files on distinct domains, indicating a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malware or conducting phishing by overwhelming search engines with links to disposable sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://dydlhx.com/upfiles/file///falel.pdf In PDF document text
    • http://lejonhund.com/upload/wozokafuf.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/15013362047.pdfIn PDF document text
    • http://www.puhito.hu/uploads/81727844626.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/25051753713.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/39974725054.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/duzapubadu.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/2579521730.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/60335783361.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/xaxotakejazirinukozadepeg.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161320fa81a0e6---57238570511.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/79552127839.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/veruvogizunizefudawa.pdfIn PDF document text
    • http://www.ezmoving.com/file/24459626018.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/90016365431.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210918053747604602.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/96493525027.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/25165336644.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/72802122540.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/26584783560.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/48553220900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=sax+video+player+apk+download+freePDF 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_off0000d76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 10760 bytes
SHA-256: 185a21c9c8978b998312d3838e7b550bc9b169a8f6a19c6275bd423009c04d40
font_02_sfnt_off0001086e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086E 20012 bytes
SHA-256: 39e6b5040523dcef7e38c3a1282e08c2bc8a39ada6d54e43e38d4c00a59afc73

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