Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5546590e5585978…

MALICIOUS

PDF

78.3 KB Created: 2021-09-09 14:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 251371643d3e494aea1f074a0cf2d6a7 SHA-1: 6d197d7563d01bf941f7ea90cf0fdfe3c7b2c261 SHA-256: a5546590e558597812e6ea836802144966cd45cfc350bc6cd259185e192eb69b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/pibikabemez.pdf In PDF document text
    • http://allasclub.com/campannas/file/motezil.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/bebodimokipedogazizeniz.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/59020147687.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/37698556385.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161393d8203b58---24296897306.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/90974794488.pdfIn PDF document text
    • http://espokebar.com/uploads/files/20479465777.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/kizogup.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/42055621265.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/dagezifijivozuduluwu.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/62885683801.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/63354784689.pdfIn PDF document text
    • http://kdekdyjak.cz/data/81633260370.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/30550251988.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/70811255519.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/mamugerapumutaj.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/42442609493.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/5175471735.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/mumalusijire.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/54749133875.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/37328768965.pdfIn PDF document text
    • http://naviway.su/upload/files/24754490612.pdfIn PDF document text
    • http://inistor.com/ufiles/files/91919896181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=might+and+magic+apkPDF 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_off0000ce4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4F 10480 bytes
SHA-256: 0b6507507bafda82ef23ce125ebc98297bfc5f643550b46462c3e234e6571d59
font_01_sfnt_off0000e5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC4 17936 bytes
SHA-256: 093e786d55205aeee33c8a27b081ea41cf8af18fb5b693300e1ab58694329473

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