Malicious PDF — malware analysis report

Static analysis result for SHA-256 22e8448c61b4569c…

MALICIOUS

PDF

70.1 KB Created: 2021-09-18 02:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: abf45c6e18e12a23fe8dc382fbb6e19c SHA-1: 78dedd3e1de56ac24031edb92bbfe6c807dc497e SHA-256: 22e8448c61b4569c638211348194ea3c1ed0f47aecccb847ae297222fe9df4ff
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JS points to T1059.007, and the overall nature of the document suggests it's delivered as an attachment via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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.
  • 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://kochitaxirental.com/ckfinder/userfiles/files/69874077635.pdf In PDF document text
    • http://nitecoreromania.ro/files/file/52454374308.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/divugokenoduvobore.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/e04e40ab9c046bbdad5a212cee7184aa/35353784644.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/kiwanawul.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/63408706593.pdfIn PDF document text
    • https://manenshop.com/upload/files/gobuvugiwawijigexejujugaw.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/71650723631.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/29580139816.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/87618571285.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/16800990967.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109092247447444.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/50825457312.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/zikezifefegojopegewoxexob.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/17301040662.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/459847640.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/tozoxofuvapa.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/zisawutigomidabej.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/47783909175.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/68496014457.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/62429094992.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/gafub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=walking+dead+season+3+apk+downloadPDF 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_off0000b440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB440 15140 bytes
SHA-256: b4d87229d75a2f1874ff96fcc44daa21b8180bbfd22c9165ae6d8c5801aee040
font_01_sfnt_off0000da91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA91 10712 bytes
SHA-256: d6cac57e7fc986bf859c77d5bc10ceedf5cd2cbdb08a3988ffb12ce59c8aebf7
font_02_sfnt_off0000f321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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