Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66c3be4b1029b56…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 01:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f8372338d81f2e479082e5143d155b4d SHA-1: 9f98b34ffdb64e91f510663de63e3d0109b0afa7 SHA-256: d66c3be4b1029b567aa61c2ea3472f4e0d34d9d5bde412adb6b858d73b25aab6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file 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 ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs suggests an attempt to redirect the user to a site that hosts a malicious payload or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://drafthe.ru/uplcv?utm_term=download+play+store+app+for+windows+10 PDF link annotation
    • http://gewidor-gmbh.de/uploads/files/xiberef.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/jokifunepexibipak.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/54667098250.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/83033853864.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/bepemotezuda.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/rojonatagoxosopotekare.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/6361571861.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec5f02462e---soniriwugofipefo.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/kutok.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/werazapusofexiz.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/nazixinuzavigasolelodu.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78590937575.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/lulimatalufi.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/widukupawi.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38223496050.pdfIn PDF document text
    • http://autokaryszczecin.pl/userfiles/file/2168803908.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/32410689353.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/bifakug.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/96131491693.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/90572209394.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/76723380639.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210901_D330EEAD3548A474.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_off0000da14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 10864 bytes
SHA-256: b7c60b643eb2533d4d4f2934d77b2286f540853735d5bef33475f2d2b0377258
font_02_sfnt_off00010b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7C 17388 bytes
SHA-256: 324d5192123e179e5ff55448955e558557b55fc2612ac12104a73996cccafffd

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