Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1c92e4ce2779ce…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 08:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ec4393b879d04283e07156ff901d4e10 SHA-1: 4fd3817b89fe0d6ca416788fca3d5bc4b5bcfeaf SHA-256: 7b1c92e4ce2779ce8ccc6a85d0f97a4d0cfbd416fe2fca78a74fc2bc8b5e9fc2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external files, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading malware disguised as legitimate software. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dailyliving.nl/ckfinder/userfiles/files/fuwobokawisunadumuwaz.pdf In PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/gowuvowaz.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/99522649847.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/92951609111.pdfIn PDF document text
    • http://azizolace.cz/images/file/tufedukuzozolexafafujixo.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161301c1896b4c---kulavokiwuzedet.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/92238830924.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/zexodajes.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/30472993687.pdfIn PDF document text
    • https://blugarden.eu/file/49329948817.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/38297513843.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/46721885746.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/94869445361.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613baba18531b---fijufamez.pdfIn PDF document text
    • http://coachhouse.info/assets/file/60145241638.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/zodezezaxuz.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/74135670731.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/tapizikosikupa.pdfIn PDF document text
    • http://mebco.ru/images/file/88399040864.pdfIn PDF document text
    • http://www.ezmoving.com/file/67920234949.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/jimikotarasi.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/viwezujukemegikukumi.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/57680526357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=windows+10+creation+tool+64+bit+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_off0000da9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 17728 bytes
SHA-256: 9f577481813c73e5818ae84af77614f92e369ae32c61b3899076f0c03f460a51
font_02_sfnt_off00012052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12052 11004 bytes
SHA-256: c41bce8566d73621b2a9e3f61676f19d65890fb8b23e316191b17ed798999c28

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