Malicious PDF — malware analysis report

Static analysis result for SHA-256 303d68593a30b0d0…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 02:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9b1d1934a8535eeb1442bd35fd8cc3db SHA-1: 60f45959f2d8ef142905bc8b002039fb02863acf SHA-256: 303d68593a30b0d076644f3d8ad292d405a0d567b69d693bf9a859ea5ad42b7c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various PDF files hosted on different domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, which is often associated with SEO abuse or distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://alutat.com/data/file/72991291679.pdf In PDF document text
    • http://qapoll.com/2015/vat/upload/files/37881562864.pdfIn PDF document text
    • http://rentator.com/uploades/fckeditorfile/17627688699.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/28481314557.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/mevubexurumul.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/fizoxevawu.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/29640278177.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/38026517127.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/kinukitesimibigexesalu.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/pipuverikunubakuvaxi.pdfIn PDF document text
    • https://iohrp.org/f_files/files/bomuzuvemugobeveju.pdfIn PDF document text
    • https://somogyplusz.hu/files/40110240845.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/notadijolukodi.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/75793728283.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/71737277674.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/83654181620.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/vapotolujorafi.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/32324377874.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/73050634086.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/jatix.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613875a53ae31---59052856067.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/98547265552.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/48068399676.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/68091050729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=crush+quotes+for+him+funnyPDF 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_off0000dba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 10664 bytes
SHA-256: 954710bcab7a6c735e202060d362c2f4392c70096238119e3274ed388e082cec
font_02_sfnt_off00010c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0B 18364 bytes
SHA-256: 6a54702008c7d95122457a52052e2973aa9ef1b4f9bed4645d4e6a8930f9245f

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