Malicious PDF — malware analysis report

Static analysis result for SHA-256 c432ea1322fb4c61…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 00:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 69cdb99ae907263db372b8c0e3c5d12d SHA-1: 2407b0cd03fb17b0fce2eeb75e96fc85c7c23566 SHA-256: c432ea1322fb4c61c283bd0e520822b31f66b8897a3eb0f1d1206d7bfa49e533
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to suspicious domains, and is described as a link farm. The presence of external URIs and the 'link farm' heuristic strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://tks-forever.com/upload/2021/09/07/file/tunuxigumapeposizenera.pdf In PDF document text
    • http://world-green-hope.com/uploads/files/72612738620.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/44577014999.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/23545882597.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/kelimi.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/c6ec67cb837e00f6a473639046eba42b/xevimifo.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/bovubiwurefi.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/tizelow.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/jubejuvapodixatuwekivor.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/tosar.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/morolovubu.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/32555049886.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/sadovudegilabif.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/79070931494.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16132814cc2eb2---37593757803.pdfIn PDF document text
    • https://masihpt1.com/contents/files/24359457375.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/17900428729.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/97881740928.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/farufekimexigugevonon.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/66548702033.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/99174023635.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/30676943422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=buggy+beach+racing+2+mod+apkPDF 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_off0000d5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 18456 bytes
SHA-256: a641355fde3fbd7a8f2466bc32a2907c271e49517b261c019c29154a06390092
font_02_sfnt_off00011d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D05 11268 bytes
SHA-256: d8a803c3e8a0735992ab3045ac37bd5d4b3ac2fe6655852a5c9595cbaa52ee65

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