Malicious PDF — malware analysis report

Static analysis result for SHA-256 520d31831a1460aa…

MALICIOUS

PDF

69.8 KB Created: 2021-09-11 15:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 0521dc0694ff24443d2252ee6986fa83 SHA-1: 4ce8efaca199276e285c82125a1380e80ff9d020 SHA-256: 520d31831a1460aaec55efe878999c0b3e6a41da41afbd07d73c7b7ed5637968
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 0.9973

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://krisoc.ru/uplcv?utm_term=kalli+poonkuyile+mp3+song+download PDF link annotation
    • http://circuitoinsulargc.com/documentos/file/63868533187.pdfIn PDF document text
    • https://kenadong.com/contents/files/rafarajateragupurovu.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/59639558716.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/popuzo.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/newolakanixafi.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/jogutodupuziwanewe.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/35359629147.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/xebixujigirififaxu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wuwimoziwefawavewaxabuv.pdfIn PDF document text
    • http://ecole.ru/text/images/file/609124314.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/mopitewurataf.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210906001810.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/kinonaw.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/68175336689.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee257d9679---33447872986.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/7406355974.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/ladafulumupovorafa.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/jufirudujumuragaker.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/muleleforipuvenuto.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133aa8cb7dca---safitogewuxosi.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/zozusavelogafolizonedel.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04E 15668 bytes
SHA-256: 652869e265db6ab29e50d2386416c2809d91938e8b29e8bafaf4cb37e48ded88
font_01_sfnt_off0000d856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD856 11092 bytes
SHA-256: 73d2f245d178937f11ff93d94bdae6f381ea3b1ce540ee8ef4a26298c36d6a07
font_02_sfnt_off0000f20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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