Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdc98762b7140c4…

MALICIOUS

PDF

70.0 KB Created: 2021-09-28 09:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 402dc95bd0d6706f9fe29ec184a01342 SHA-1: 1d1d3e0561d384d6b315eee0f52c5c6ef5e0f277 SHA-256: 7fdc98762b7140c42c3d7c75dfc5c12f01db5bb1d74f6191ef7031c21cdfcc19
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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=samsung+galaxy+s2+boost+mobile+review PDF link annotation
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/tutazikijoximi.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306921343c5---63168929189.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/50046174540.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/73299184327.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/xuzobutovajobuwiki.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/20417247123.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/sexemo.pdfIn PDF document text
    • https://baglab.pl/galeria/file/66853959309.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/34607907953.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/63288390092.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/megexivunokuratokarodim.pdfIn PDF document text
    • https://tuinvandecruys.be/file/10519448492.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29054669164.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/wezibejidero.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///8125165477.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/dikuvutuvuponinajobe.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/561a0bc37d4537027bf3043c9a9a72fd/tizoperokubenepisilisi.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/zeviboripuwigadazez.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/vareruxudojumazeko.pdfIn PDF document text
    • http://kidzcastleschool.com/singhania/downloads/file/rewetinimijem.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/vuxudebusugaxi.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/nejabotiwidoniwugupufu.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/6818574747.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/sagepubajebisotivapujefa.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/nomepuxupar.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/majozubujos.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_off0000b29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAC 14732 bytes
SHA-256: bea770e5672012d64387521ced960773c2b2805783114c97ed6fda3fe9a11b54
font_02_sfnt_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 11252 bytes
SHA-256: f3d071e4ce1bd393dbc3bc1a974f6957ab2e5fa3bb26d5fe0935fec5a82e47cb