Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6115c03d881175…

MALICIOUS

PDF

78.0 KB Created: 2021-09-13 04:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: bb609f22748d562751fdfa6eca735f5b SHA-1: ba3600b4d0b5ed0039a37aa5fb20b7ddfc92ad95 SHA-256: 2c6115c03d881175666ef685c72d16ba04db4ff0104874e0dfdc60ca7297508a
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/xurakunimusima.pdf In PDF document text
    • http://veszpremlizards.hu/_user/file/zifejigawijami.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/74408098713.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/40757450081.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/25908194587.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/vugemetudomidivu.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/gugulopilo.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/situmimanibebituvewigovo.pdfIn PDF document text
    • http://biomedia.asia/upload/ckimage/files/4584737990.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/66371382058.pdfIn PDF document text
    • https://adium.ru/userfiles/file/fasitovi.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/37019714762.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210913044217.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/kikapajexaxewir.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/53588122797.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/36206962682.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/19563733606.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/boxutopevuxuvoboderi.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/zefowodixifijuwisukofo.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/vibewijurakoraruwudo.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/magosilotegabusawuz.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/45814896847.pdfIn PDF document text
    • https://seerupit.dk/assens/file/kizadomuwukipelo.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/jijafudufagor.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/38632937906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=der+erlkonig+violin+sheet+musicPDF 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_off0000cdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC3 17256 bytes
SHA-256: 47d8f7a3467f19bb876bf25d7a8cdf6196b476c80b70d292625ff3dd07061665
font_01_sfnt_off0000f9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BD 10776 bytes
SHA-256: d36758217b1a74baf445550e2d702f5f7f16c59ddaa0600c1f6c1925d4869ff2

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