Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5f0d5583064695…

MALICIOUS

PDF

86.7 KB Created: 2021-09-09 06:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4263248460cdbbf63ca2248c1feb335f SHA-1: 8b0432946c87747b0839bf07968e3b294ba021c4 SHA-256: dc5f0d5583064695fba9883511d5ccf6dbaf3d0a2f310f583c7fa24520e37698
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, a common technique for executing malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent. The document also contains external URIs and heuristics suggest it acts as a link farm, likely to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://stolizstekla.ru/userfiles/file/lebajid.pdf In PDF document text
    • http://nadiadsa.org/userfiles/file/nuwanaserivedarujas.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210907_12FA91A492FB25A5.pdfIn PDF document text
    • http://chemicalengineers.ie/images/gedevituketufaguvijofabox.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/desumelevatam.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/famizaxokarasadimegigi.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/sixivilaperufurogedoko.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/5235382998.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/22687284372.pdfIn PDF document text
    • http://tradotel-riviera.com/file/togixedobupam.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d6f883012115aa94fc09ecffad84aa4b/1906272300.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/28305871743.pdfIn PDF document text
    • http://elsped.hu/files/file/bexinelazejinitafodof.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/60614162477.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613066438f50e---54200840652.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/28477354525.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/53046911096.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/isegu.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/tekidapurizipesifawupuguw.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/gafenejezeto.pdfIn PDF document text
    • http://rilta.net/userfiles/files/54115213752.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/83158075329.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/zafuduxiwoxokikulob.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/lisuvuvusujire.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/25258623666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=best+call+recorder+2020PDF 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_off0000ec4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10464 10464 bytes
SHA-256: 94c4b1e8dc9142f14f37388ddbe65a8959a12df484e807c6cbabee9ea4620cdf
font_02_sfnt_off00011c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C61 18912 bytes
SHA-256: f5f75d2076cc639cf0b33577ca15abd716c9dfe0fd70f55e27a52ccd81098a49

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