Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf44f79ddfe432b5…

MALICIOUS

PDF

79.5 KB Created: 2021-09-08 12:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 728fb3b6a8c29473f3228a5fb6a6994f SHA-1: cfb7f222043092311047f47704f6b4db3a0a041b SHA-256: cf44f79ddfe432b5b2270aa44b148ff6065c1020bca4e8e31b1921969c7048f7
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 0.9846

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://coretry.ru/uplcv?utm_term=fewer+less+worksheet+pdf PDF link annotation
    • http://darslaska.org/ckfinder/userfiles/files/27749682386.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/dawikigisebewo.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109031212346753.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/93392278437.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/mefopiv.pdfIn PDF document text
    • http://net-work.cz/data/file/43487011853.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/88672491436.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/labegubeguzezedujupiv.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/powofogubajatunojo.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/dutogetokeritexagupafeso.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/ditebazavefobadujenizi.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/25877700229.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/nudesovuxube.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/zaxipogu.pdfIn PDF document text
    • http://kme-kme.cz/files/file/88666741878.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/13815291832.pdfIn PDF document text
    • http://bienbao.org/uploads/files/29983786344.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613496357aef0---jogosivo.pdfIn PDF document text
    • http://twilaw.com/files/files/17748504819.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/63223589305.pdfIn PDF document text
    • http://ducthai.vn/userfiles/file/tepajovoxemizimusog.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/nadagusovifu.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/42209337579.pdfIn PDF document text
    • http://allier-genealogie.org/File:/mumovuvegevatiwetal.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/kupamamif.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/53780707273.pdfIn PDF document text
    • 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_off0000d3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 10392 bytes
SHA-256: d2ba62b239cbaa45bdb4ec768449b75ab7aa60ce001522d02e293c82b84dc130
font_02_sfnt_off0001037f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 17504 bytes
SHA-256: 6b379add3db7bdf1c7322b672042e8bb83c804265244c6b03777875b593d7dfa

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