Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a6253871dcc1fb…

MALICIOUS

PDF

86.4 KB Created: 2021-10-06 20:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4f2f26f33a96ebda3e0d46c1bd94702c SHA-1: 10d402730c6f58630c65637e01278c88e920d140 SHA-256: e4a6253871dcc1fb3569df05f4fba32a3162087ee7986cde45fcecf9338d0f19
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a significant number pointing to unknown or potentially malicious domains, suggesting it functions as a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the PDF is designed to host many links on disposable domains. The primary attack pattern appears to be redirecting users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/61c5ab3ae100a46b4765f492b684519b/82193111267.pdf In PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/gegozeromiz.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/viraxovogafebesu.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/tijisisamutevemawakutoto.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/fifaxurukure.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/69684408975.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/laxufinas.pdfIn PDF document text
    • https://pedrazzini-legal.ch/UserFiles/File/mugefamotatogak.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161597da7320f3---nogogirezawadavularesini.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/rodimotekalit.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/86065864087.pdfIn PDF document text
    • http://orem.mn/uploads/files/votunevoxan.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/bumekimevawukavobikabifu.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/pezalefitabapojel.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/73778116719.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/51486844389.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/bafexidufevatob.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/41366130010.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/23231573358.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/20016556792.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/42124022751.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/sobatedijibamivezop.pdfIn PDF document text
    • https://dukupahit.com/contents/files/funupor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=a+walk+to+remember+ratedPDF 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_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 19132 bytes
SHA-256: 7b58168d0d635ccfa6aabd7b0defe2a6fd2b9e80501647bc800ce4e725a80805
font_01_sfnt_off00011c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C69 10344 bytes
SHA-256: 2e9b72f70cdc086e3353132c05314661ea33fef7d8637acf11cb89c2c74ac70e
font_02_sfnt_off000133dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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