Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a9763e65cfe135…

MALICIOUS

PDF

80.2 KB Created: 2021-09-09 15:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: b9d68bb6a2e4a41ebf606b87a99a8fe8 SHA-1: 98b99ace37fcc1fc006066a6b2b04fe562275ae3 SHA-256: 40a9763e65cfe13560c2b98dc25417bcee469c518bd77e615c6c8aa4f43ff843
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://huntic.ru/uplcv?utm_term=ludo+king+old+apk PDF link annotation
    • https://patoman.ro/ckfinder/userfiles/files/bixukiwikevanadimakasu.pdfIn PDF document text
    • http://maksimetall.ru/files/naxiruzasaxapewofijekuxi.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/94543843137.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/xuzezesan.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kexazupuvosi.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/24765015407.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/26449951668.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/jikolavuna.pdfIn PDF document text
    • http://armanetti.com/images/92783939207.pdfIn PDF document text
    • https://vpmemorial.net/images/file/dalinesovu.pdfIn PDF document text
    • http://aweibel.com/Photo/file/fupemaxexemovomibepon.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/tagowaxiru.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/50583604996.pdfIn PDF document text
    • https://magatek.com/documents/file/toxef.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/94155878499.pdfIn PDF document text
    • https://linardi.ru/files/file/24139240018.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/basobiduxilidovosonevev.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/56691999827.pdfIn PDF document text
    • https://almavilag.hu/files/files/83111783806.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/wusaregejulujiza.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/tidawigonemubuvekanokogaj.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/sofuzokavoleb.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/zowoz.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/pepaban.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/xefiwemunafaxevarusevafa.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_off0000d29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29F 19364 bytes
SHA-256: 6c0c3b62d609c1a36e6366091531a98db7df67d1e77daaf1bc23dca68204632a
font_01_sfnt_off000104be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD5 10216 bytes
SHA-256: 9396e80875554e6a353f426d76100819da3185088e75e4b017c019909efb2d64

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