Malicious PDF — malware analysis report

Static analysis result for SHA-256 db01f915e3869406…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 03:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f7ec11ec9112a5482d47509c268f340a SHA-1: 70741ea608438a32346b6f3eb80138112abe67be SHA-256: db01f915e386940600ca05945a12f90454b691bdf7ae646b6ffc6d68666ccde6
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains, suggesting a link farm. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive and provides a password, a common tactic to bypass gateway scanning. ClamAV also detected this file as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://architektor.ru/uploads/file/rixerilutida.pdf In PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/timumunabimuvidoxapiw.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/56741597002.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/busidedotalup.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/49599108991.pdfIn PDF document text
    • http://szpk.hu/_user/file/97178905907.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614071ed5d44c---pagidimotefedusil.pdfIn PDF document text
    • http://micruts.org/userfiles/file/39688849499.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/nidajuxugoziv.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/27400868174.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/rutokurifekojoveden.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/89790835475.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/44166159262.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/70869906445.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/77511107522.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/64784382663.pdfIn PDF document text
    • https://full-e.com/app/webroot/userfiles/files/20210916_054231.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/46183586483.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/dezudopetububonerer.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/96786606757.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/xogawamefitomevijupejavej.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/pojodexipuxumopikokelalab.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/faxiwudonugixilu.pdfIn PDF document text
    • http://wingtsunkungfu.ro/imagini_ws/lorozo.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/bomegegerijomikosiju.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a03359748---puzafuzoriropubilutiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=adb+backup+extractPDF 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_off0000d832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD832 18268 bytes
SHA-256: 9854d5558ff3b406d38f2404dac279f7a1d20947ae15beb13a3b3c4ff26dd69e
font_01_sfnt_off000107cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 10392 bytes
SHA-256: 2bf55063d20968dcbde46782df9c9ab1842d2dca6a313516b418ee13a1128676
font_02_sfnt_off00011f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1