Malicious PDF — malware analysis report

Static analysis result for SHA-256 6507a72a51eb560c…

MALICIOUS

PDF

77.6 KB Created: 2021-09-12 06:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 29090960ee68b7b3f59a6350ebb037a6 SHA-1: 6da52e28852b09765543f7acc47b10e0ec38800d SHA-256: 6507a72a51eb560c6d283d1261e4860493eaa37df46728227942b8aae8bac04f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, a common tactic for phishing or distributing further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://yoshitomo-kokubunji.com/jcfiles/file/76522207514.pdf In PDF document text
    • https://techielingo.com/fck_uploads/files/29188015829.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/53907181407.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/71500075586.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161327e2ae6b1e---59575356806.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/28710713853.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/8896996854.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/bimalalerarogutureter.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/47297423073.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/15956069195.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/6163991142.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/51352043728.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/48061761695.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/fosororazopopugogubuti.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/kuvovomudulapaduzulenabep.pdfIn PDF document text
    • http://sdes.in/uploads/60163500879.pdfIn PDF document text
    • http://konberdbio.com/upload/files/88856158874.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/45229763393.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/70646260590.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/61692393455.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/17769531352.pdfIn PDF document text
    • http://ned.ru/uploads/files/16675210318.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/xegejigapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=avatar+season+1+onlinePDF 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_off0000cd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD00 10200 bytes
SHA-256: f53b88c5564afb1ea1253425c600b82cc460cb4cadc9a522e7d432e7f8200cae
font_01_sfnt_off0000e414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE414 17516 bytes
SHA-256: 0eb6d1a8e8e465f645cdbef60ea97862728b43d4d8475404b12b6a32e7277adb
font_02_sfnt_off000110df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.