Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7523158a894a3c1…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 21:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9124757b048d9846f42aa25b800c956b SHA-1: 9ff92824c36219ffd08c77f411ba1c2cf694066f SHA-256: c7523158a894a3c146b2b3a0e7cbdff35fe8b56b422d2a5add2a059fd72c1883
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The PDF structure and embedded URLs are indicative of a spearphishing attachment, likely leading to further compromise or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=android+21+dbz+kakarot PDF link annotation
    • https://hsiaoying.com/userfiles/file/fopeti.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/50207359395.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pinexoveki.pdfIn PDF document text
    • http://telektrans.hu/editor_up/xofemegozela.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/wurigodi.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134429225cd1---21314430465.pdfIn PDF document text
    • https://longhoang.vn/upload/files/6111382424.pdfIn PDF document text
    • http://devison-matras.com/upload/file/67498216914.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/8f4ceb52bb8401544b4d62dcfaeb78b7/95186157776.pdfIn PDF document text
    • http://bulmarconsult.com/files/wereb.pdfIn PDF document text
    • http://www.77ice.com/upload/files/mizedujubuzitojis.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/vozuzuvo.pdfIn PDF document text
    • https://servauto.fr/img/user/file/pilim.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/38153545463.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/segivilabomiro.pdfIn PDF document text
    • https://umutfm.com/resimler/files/ninekobekugipotonawoluwam.pdfIn PDF document text
    • http://soupworld.de/upload/file/zafomedanilixono.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/14868512264.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/gilipepuk.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/nagafase.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/88416850513.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/35892047196.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/vufovaxejugubi.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_off0000d909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD909 10340 bytes
SHA-256: 149e9b72888b80fa148f4301741232692f6d5ca708d2de8b3f7f658a3e29a8b6
font_01_sfnt_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 18876 bytes
SHA-256: 6a07dc1e69e09f9090890079c74b5b853764d76616fdef84b41cecfa1b9fa449

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