Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3f2404156185d8…

MALICIOUS

PDF

73.0 KB Created: 2021-09-22 20:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1e13d1286d0e2b23a65f88a9dba05a98 SHA-1: a2b8e67da90d5d2d96a0151730ee185b5b7f7453 SHA-256: 8a3f2404156185d87c72977c49ed3e382ed7ec5cf27495261d4b0eabbfd6ee0b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of multiple unknown URLs points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://enewind.com/pliki/file/jimanunotikefedubolu.pdf In PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/d1592b28025b32343de0b7724e9ac77f/42428602571.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/55479520209.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/44036786981.pdfIn PDF document text
    • http://tfforming.ru/d/files/95370399950.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/21191884980.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/gijavanuxupufekewurizo.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/94276849727.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/zoxipezarufuk.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/29981736882.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/41987424509.pdfIn PDF document text
    • https://akemi.ro/hirek/file/55535465848.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/jepuv.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/67274425596.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/98692208003.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/54475425276.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/bisudager.pdfIn PDF document text
    • http://ipllaser.in/uploads/11909326126.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021091706365673499.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/gitavowogogenebobugomijow.pdfIn PDF document text
    • https://quizai.com/uploads/files/89926889103.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/mixavigoz.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/52605902750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=android+1+hack+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_off0000be6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6E 10292 bytes
SHA-256: 10cf445a981dfa2ff0ba58f263c3447b632257ec67625947e380d40b8d98a305
font_01_sfnt_off0000d585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 16020 bytes
SHA-256: 94173d326ab08b613f1c521ef0c2979f7168c0fe50760f5b65f5bd7e27cb2537

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