Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92b8c5fc9c43faf…

MALICIOUS

PDF

68.6 KB Created: 2021-09-19 18:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 56fdfce696e46368c17476df1ccc298c SHA-1: 6efe6cc6a2301910fa1539cd4e1db342a3f4fd68 SHA-256: b92b8c5fc9c43faff3ad35ea1529ca3b7d55f5d5204956dffb736ccab5caca46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and are likely part of a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to obscure the final destination through multiple redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.cottagegrad.ru/files/file/83271745995.pdf In PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/winogizamogededeboginotiw.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/bojuve.pdfIn PDF document text
    • https://stvorki.ru/files/file/95075542577.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/lidagilarafenited.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/doranakaxovi.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/17437009556.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/xokekepuwu.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/kibelufezet.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/18283145304.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/rakukekemopudipeleladel.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/zuwadofor.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/digalerebaz.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/punem.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/18515481515.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9f21b8670---96374771859.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/22807528465.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/liwilumojorifubuvovafefib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ios+15+android+facetimePDF 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_off0000acb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CA 15780 bytes
SHA-256: f804aebc52d0e6e051d3e611349fbcbc43278daf95300e749ac7f5a726d70f30
font_02_sfnt_off0000ecbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBB 10728 bytes
SHA-256: cffd1a1c43a699ad1283dad4fd18e7fb7be265b5ac9914ecf70b2570115e798e

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