Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c65f18ccd947317…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 01:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dcee1cf40f00d928062cc2886047ca40 SHA-1: 9d46dc4e4e32d156ae4e74dc77cc2858a5c00b26 SHA-256: 9c65f18ccd94731704cdf41af3d17af19f48ef671ff33189d77ecb61fcbad3ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable hosting, characteristic of a link farm designed to distribute malicious content or facilitate phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/uplcv?utm_term=windows+cannot+be+installed+to+this+disk+the+selected+disk+of+the+gpt+partition+style PDF link annotation
    • http://evopizza.lt/ckfinder/userfiles/files/sovuzurodojezewotofola.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/95908305947.pdfIn PDF document text
    • http://cbstav.cz/file/dokefiz.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/10803670250.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/nuxazola.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/75595805455.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/vitiroxamulitaxaro.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/vuwovimebifepilibomafafip.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/jexanuf.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/12975230222.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/9505111874.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/puvivonoras.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/54153244925.pdfIn PDF document text
    • https://eventaipei.com/upload/files/sukugotemarefut.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/2916370470.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/nizilunir.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/67148020323.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/99648606583.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/17787066701.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/mimebatuwonuvoje.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_off0000ad06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD06 18080 bytes
SHA-256: 8887731e37f773e1e5418dfc215697c6c2c4b55b1f0742c663d104210968c6d2
font_01_sfnt_off0000da45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 11324 bytes
SHA-256: df4fd0276d98ed627b35e0b2469f1e00b4648973413746b01b5b08ecdafe808b

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