Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa24eed055334779…

MALICIOUS

PDF

67.7 KB Created: 2021-09-28 02:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c04d5b5b682e63540a98aaa418553d34 SHA-1: 8ff44233551b17437dceb2925420a6c82651ec39 SHA-256: aa24eed055334779bfb985212d4fddb02788cb71e232b50f384d6193a796a2e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://tonmathunglan.vn/upload/files/jozujewuxedifozabanazi.pdf In PDF document text
    • http://homeloanz.net/images/e/file/bamamikena.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/42856314319.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/pumelukekavanonagijuwodim.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76076337516.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/95310653982.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/cf6134f1b59735f79c7e8bade5839b3a/98859149476.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/vuvopiz.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/40579775649.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/gofekipipajumibilosizobo.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/87966849939.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/zoruvukutanudobaguxa.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/kofusodifetetu.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/nijodov.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/90076117850.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/votakibobu.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210911080437.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615034937e8ef---lazejivigatumikojisop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=expand+storage+on+androidPDF 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_off0000ac1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC1B 14868 bytes
SHA-256: 2a6548f8bec65fb8df30f5f144e8e31d7d623379bd1a4f395028ac3c16235c9e
font_01_sfnt_off0000d196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AD 10604 bytes
SHA-256: 1db3119559a49ab1312ef178e4d83a138e3d6083be61eef95bae17c388c1e727

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