Malicious PDF — malware analysis report

Static analysis result for SHA-256 695a428344f1ad05…

MALICIOUS

PDF

84.6 KB Created: 2021-09-22 12:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9b4144fd01bb915746ca06742e9a55b0 SHA-1: d3212203cb28f7b78205a6419d6d0a9d928a5587 SHA-256: 695a428344f1ad05a49798653c9492c2f8b5d618fe29e449b239e0153477e90b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links to other PDF files on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the nature of PDF exploitation often involves embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://kbcsisa.com/upload/fckeditor/file/kelekapojat.pdf In PDF document text
    • http://jurabos.nl/include/editor/file/nizibeligimixewu.pdfIn PDF document text
    • http://opsir.eu/files/file/1890852646.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/podamosawufarinisotur.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/15790830207.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/98738155162.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/xosamivafalisepeledi.pdfIn PDF document text
    • https://hotelcorona.ro/files/14887667275.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/983c01c29197f509af12f238d8a17df2/17339362922.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/77317641663.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/nozejaxidep.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/81698396398.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/54096018367.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/rutokudefigine.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210916185843.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/koguzusimoduw.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/kizijeg.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/xizuwejatafabof.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/13594155868.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/75014888033.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/gojovege.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae8e400a4c---lepalifebafexipawudo.pdfIn PDF document text
    • http://dellrein.ru/content/file/jagitibi.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210901170048_uljr4d.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/30183526158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=julie+garwood+dar+pdfPDF 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_off0000e1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E0 10480 bytes
SHA-256: 1022a3b2ff0e794c89065106ae416c776faf6cdc144340ee3a8fcf306359ca30
font_01_sfnt_off0000f9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 19740 bytes
SHA-256: c58e8433553dd20fb02586925f8abfd319286a9cb4c4dfe6dc8007fc9fec2041
font_02_sfnt_off00012cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1