Malicious PDF — malware analysis report

Static analysis result for SHA-256 e494fda9eb5a862c…

MALICIOUS

PDF

78.4 KB Created: 2021-09-26 15:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 41278f4416408503b02d5103868a51ef SHA-1: c08ec998ef7b0ac22718f795083d3ce60d010e81 SHA-256: e494fda9eb5a862cc5a73215016ed8a57f768c005213ce086b7546d799ad59e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing malware. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ansonseatery.com/uploads/files/33599338715.pdf In PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/zuberuxiximurixomanakogi.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/35963544667.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/012247472007.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/gogegijazufikuf.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/56317455655.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/fegodasasabojijege.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161467757e57ed---fazopuvut.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/25637329347.pdfIn PDF document text
    • http://jfe.hk/userfiles/19871794855.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/mojufinetakudote.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/34130152721.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/resitor.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/jerejuf.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210920064713.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/kaguregitupivi.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/semixetukot.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/zufosi.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/84632194657.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/96444239076.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/1158024815.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/zezotipawawopesajela.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/83011436506.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/62074301994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=android+5.1+1+lollipop+zip+file+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_off0000c540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC540 10604 bytes
SHA-256: 2407c79c6552f51a0a246b35b9ab637f0cb6997ff572b4c145f10e7387919a14
font_01_sfnt_off0000ddbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBE 19720 bytes
SHA-256: 4804edf0e91dc1c25bd888566699d399d904d681b2f9a256dbbb3bc202ce0f86
font_02_sfnt_off00011142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1