Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0bf783e0b5c4142…

MALICIOUS

PDF

83.1 KB Created: 2021-09-21 23:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f4682f923a16c2623948eb8a77736592 SHA-1: d089c9b0a7ed3f14b94291b1c185c51b8eb259ab SHA-256: e0bf783e0b5c414285d0a29eaa29093c658f427623d81d26728e96a599d1e588
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including PDF_SEO_DISPOSABLE_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs strongly suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

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 https://www.sacict.or.th/ckfinder/userfiles/files/58907687008.pdf In PDF document text
    • http://tcsm62.org/uploads/news/file/13585952079.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/rirobibomikar.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/tavufinofowekutomeluti.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/magerofisabeda.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/bejifulibaririfowovawotor.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/wopixewewatofomadirubega.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/vigedevojefositojux.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/defigukazogusalatijadebem.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/89380823318.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/36975623021.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/fegenupavakelakomegoxenum.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-9/20210909054740258208.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210905123805.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/dimupiki.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wiwofogijireneguf.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/43289259252.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/31163994548.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360f5c51e1e---59214877415.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/82795192236.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/52785803528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=real+football+mod+apk+unlimited+goldPDF 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_off0000dfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 10952 bytes
SHA-256: fa8d32ccc82b478a37d9ebf5d19aed6719a315670f62c590c863e521c737db88
font_01_sfnt_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E2 17632 bytes
SHA-256: 8d5ed566379198d28a963d993b5c9e6c13c344cb0164128aefb6b6decf5cb4a0

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