Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a768183e0c7777b…

MALICIOUS

PDF

82.9 KB Created: 2021-09-22 11:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b10904543c6ff956ea4973a3fe70abf1 SHA-1: 5d94b3b1ca180fd3738637383c10b0dc70c583a6 SHA-256: 9a768183e0c7777bc3548b7b179eda05e2a3a014ca64741cdc5311513a36aca3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded links pointing to various domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=asphalt+8+indir+android PDF link annotation
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/41664674821.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/e84ainoou8jemh3j2rkj0v2m87/74832256449.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/nopojugufupex.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/47858256995.pdfIn PDF document text
    • http://ds-dq.com/uploadfile/1632186525.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/lajebu.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/zulaxezaweboninefubapu.pdfIn PDF document text
    • http://onlineauadms.com/ci/userfiles/files/95137120177.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/junujekigexewexuw.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/budojafepaxaxezidap.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/53415857104.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/kedajufugirapif.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/batag.pdfIn PDF document text
    • https://kopari.hu/files/file/ginepiwopotob.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/23615915661.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/55921999343.pdfIn PDF document text
    • http://friulanapanini.com/images/file/64993741049.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/vuwilipunexowogiburineka.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/jezevusaxarekigerinulam.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/95807985778.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d10e04ae1dc15241dd3b1156809391dc/kigivut.pdfIn PDF document text
    • http://sjhtractor.com/d/files/38678780563.pdfIn PDF document text
    • http://sdes.in/uploads/mibiraxanudelowamiw.pdfIn PDF document text
    • http://sdds.be/userfiles/file/kujibatajonumumoru.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/loruxuzujedekuni.pdfIn PDF document text
    • 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_off0000dff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 10544 bytes
SHA-256: 0b6a85acb89e80f42502a597819ea0a79cdbe74f9ede12a5fc5a55a06ed1bebc
font_02_sfnt_off00011008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11008 17568 bytes
SHA-256: 1a86c84da6ee7ad82b15616230cc4cde7f4e0b23ae6e7873ba0154aaddc22278

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