Malicious PDF — malware analysis report

Static analysis result for SHA-256 cddc41b53e6cf4f0…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 11:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e578e5b0fcfe942c2dd20e6f1a272914 SHA-1: b8646a42f9da5696d1d24016cba8dc74e508464d SHA-256: cddc41b53e6cf4f06864900946f72f09bb7beaf9f8d7450795254ba07d1b45a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing 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 redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final malicious destination. No scripts were extracted, but the overall structure and URL patterns suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/15463090962.pdf In PDF document text
    • https://fnb-concepts.com/images/uploads/files/bepowibisiximepuzowutifaj.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/65934566549.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/93496015308.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/rijusutofixixaxuxulew.pdfIn PDF document text
    • https://alariel.be/userfiles/file/popibekewezokebe.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/ralizevememuwutojawevo.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/87942850150.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/lepagoxerot.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ln6q4534thpr486ftj926r6el3/3832951808.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/84484427799.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/30482926126.pdfIn PDF document text
    • http://lex.tj/img/file/lusakazag.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/sesafenadunuxigerezanezan.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/9996119323.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613638c27ebcb---jerefamanematakogixezepi.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/riziroxaxuxuwidesemudatiz.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/35856350042.pdfIn PDF document text
    • http://synphabase.ch/upload/file/pakegefirenifadis.pdfIn PDF document text
    • http://thevalleytrader.com/files/85428377428.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/kelupojaxekowigigerukuka.pdfIn PDF document text
    • http://polkovnik.su/upload/file/refikizuniluze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=all+video+downloader+apkPDF 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_off0000d381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 19672 bytes
SHA-256: 98ec0f723ffac228a264a09aade809549adcab403782d293f025d1f400055061
font_02_sfnt_off00011ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF1 10344 bytes
SHA-256: 70ab0b905f6f5da986e694e452269ea326d2bdfc23c231dbe76f4a975f300d0d

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