Malicious PDF — malware analysis report

Static analysis result for SHA-256 66fa51d12d801d56…

MALICIOUS

PDF

68.0 KB Created: 2021-09-24 13:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cca676d9a71340fe0f8b532d7b4b0bc2 SHA-1: 3cc5062959a9ea6c37275b64802413289e1ad23d SHA-256: 66fa51d12d801d56628299f76bfd198952cc166460e68cc73ec1babda524d4fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malicious redirection attempt. ClamAV detection and ML classification further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lure users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=neha+kakkar+ringtone+2021 PDF link annotation
    • http://kodemari.info/data/files/46511858856.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/268253450.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/64795714921.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/dewobakututapapomulazimug.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/473673487613d53a3ed98b.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/pudibesekabegugoxojerita.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/1108155009.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/viwexutosawibobuf.pdfIn PDF document text
    • http://healthywithhart.com/res/file/doneruxudizamoguvagajokad.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/zusanidefipep.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/0g1tjr7df9ivuqhhhenl2mv4b6/razamuginim.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/83916616484.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/32587716542.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/47855695637.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/manaxovowafofaxuwer.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/40801462020.pdfIn PDF document text
    • http://att-na.com/upload/20398080072.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142255856445---tewakirunumajibavazid.pdfIn PDF document text
    • https://olajpark.hu/files/files/dumoxigop.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/31968536637.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/besulen.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_off0000ab2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC344 10536 bytes
SHA-256: 742f99d38f2ca35f84bf15d701365ff4fff0a3e4922c58c69333bac37e9c2912
font_02_sfnt_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 15712 bytes
SHA-256: 213217193c31a031cc41bbe04d540836a85cbc819b06f2e285b20ffddf354347

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