Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d384b5ce22b4cf…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 03:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 71c1054baaa1ce6378c5fd6242a66a8a SHA-1: df03c8a87ce5562430b869ffc4c14752061655a9 SHA-256: b7d384b5ce22b4cf84d0d6c9584e840613c6fbb6d97f939b163579fce965e5f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the true destination. The presence of these links suggests an attempt to redirect the user to a malicious site for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://tcsklife.com/filespath/files/20210910222059.pdf In PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/71785225568.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/82302295823.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/ravovilikatisexikobarupav.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b0f3dbfcd---runuge.pdfIn PDF document text
    • http://submission.jpvm.kr/pds/userfiles/files/duvogozosurezabebobe.pdfIn PDF document text
    • http://c-six.it/userfiles/files/bejelileze.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/pojawebegutozupasofaz.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/17330881564.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/gejenulumiw.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/pebinanozupika.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/wozunedezaxes.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/janubigujalusoku.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/turabivowizamefoxubobili.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/rafitunejazosuk.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/77209705521.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109091538565581.pdfIn PDF document text
    • http://healthywithhart.com/res/file/kegojerobexakiburis.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/tupovofixurufonobev.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/laxirexebesisivuteg.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/31132999308.pdfIn PDF document text
    • https://webmanagement.produse-electrice.ro/images/file/97178096145.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/jejosuvaparedifalaribulol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+transfer+a+file+to+sd+cardPDF 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_off0000ade9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE9 16192 bytes
SHA-256: 7421971afa4eaa1a5e6fae15a780d740d7a348520d6f1e685728813814c424e9
font_01_sfnt_off0000d7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E5 10548 bytes
SHA-256: 584d9a441e332caac23ab26a0c46e3749938e68425a4dce6cf0d3374efae0a2a
font_02_sfnt_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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