Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3db79a18ca54b37…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 13:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0d6588b047407375e4727f73a78ddf01 SHA-1: 63b89d503a0e5babb852785d55bf1d9fd9a13cdc SHA-256: c3db79a18ca54b37578ca2e0a5903e86ae1d5100e8b6373a18f08ca93dda3bb1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external URIs and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristics indicate it functions as a link farm on disposable hosting, directing users to potentially malicious sites. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it is used to redirect users to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://inwebjor.ru/uplcv?utm_term=download+hunter+assassin+apk PDF link annotation
    • http://emotionpicturesfestival.gr/userfiles/file/62774977843.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/76118310746.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf1a49c11---mitejizufosusapuda.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/zarawukasusozimirovuratof.pdfIn PDF document text
    • http://tochuchoinghi.org/files/dasasu.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/vunekimemi.pdfPDF link annotation
    • https://vanphongphamhienluong.com/upload/files/69661353258.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/naratozofokokopulowerag.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1d1414d14---35728338919.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/vujeridewoxelam.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/dometetazikuwalubitanazew.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/91128927526.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/memerejajirizenipogo.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/metidozosubedo.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/34203235056.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/95985275831.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/81590479984.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090508362445.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/62323340229.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/66665399245.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/vezisowo.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/zanit.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/rawasalolonamomonepag.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210916/16317551376765.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_off0000d522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD522 19872 bytes
SHA-256: 0eb7a722fa185e9e57b9460d5385c765658128e45b88e2fe1948ed615647466f
font_01_sfnt_off00010984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10984 10768 bytes
SHA-256: 62f2dde96d5b4f37fdfbc3f0a8eda59a45a1dcd8e6cb4d6ea5b418c37d446457
font_02_sfnt_off0001224b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1