Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6fdc6b537421909…

MALICIOUS

PDF

87.1 KB Created: 2021-10-12 04:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e9d37db5b5852aa1076f5bf3334b4c6e SHA-1: fda429980d8ae1f4722a94db5a98d733a806a877 SHA-256: c6fdc6b537421909726e98339a7d0ead26e6dcfc301fbae0e0c46f751dbf7e5d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF utilizes a link farm technique, hosting numerous distinct PDFs on disposable domains to obscure malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely phishing or malware distribution. The embedded URLs point to various PDFs, suggesting a broad phishing campaign or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wanyuantemple.tw/userfiles/file/27209131540.pdf In PDF document text
    • https://aymsoft.us/aym_image/files/84930589869.pdfIn PDF document text
    • http://juha.be/_files/file/ganugubinonidopoloniki.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/lawanoxozelawaf.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/gopuguruxomemozujibulaso.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/tozerikikegefejorejale.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/rudugopabatexudijazow.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/14618355210.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/8221964917.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210914_54EFC0A74BF92207.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/logul.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210908_3B46D0880F3AA55B.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/8806189482.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/turodumaka.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/p5nli0deguelduipge5pn1uusp/rawiranivuxoj.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/18237544068.pdfIn PDF document text
    • http://teraval.cz/res/file/nizefikulilinufilibajof.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/14224694875.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16142dfd7120d8---jobakaxawumup.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/jorazamewoxanevagerobonip.pdfIn PDF document text
    • https://iword.de/userfiles/file/katulalenega.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/fekat.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/8634373119.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/muxawu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/6Zflnl449io/uplcv?utm_term=government+guidelines+for+officesPDF 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_off0000eb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B5 10864 bytes
SHA-256: 5eb8bf58e41681dfbbb7371effdf375e61dc0d08707aa880870bd077b182b428
font_02_sfnt_off00011c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9F 18940 bytes
SHA-256: 85e52950f08215491e6bd87440bfd31708c144a5e275d45a9c477521d6cddf87