Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea14e2065dc8afb…

MALICIOUS

PDF

88.8 KB Created: 2021-03-26 07:39:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52a9f7799e67f733941849d93c4af8d4 SHA-1: 234b46ebbac7d2fc5a36b0cad9c469af15b6b55c SHA-256: dea14e2065dc8afbf6339a7e157983e58806e7e0b8e66cb45148939403c95592
156 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The document body, though partially corrupted, suggests a lure related to multiplication tables, which is then used to redirect to a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=tablas+de+multiplicar+hasta+el+20
    • https://jokonufukitis.weebly.com/uploads/1/3/4/3/134399540/zexaxivuduviwifuj.pdf
    • http://meine-gebuhrenfrei.com/71669041454ax55r.pdf
    • https://nazutusimeraj.weebly.com/uploads/1/3/4/8/134883567/57351ec.pdf
    • http://13millions-warzone.store/3077137266258r43.pdf
    • http://rapegutuxipik.22web.org/xesatuxoxonidekulidosi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sovotovagito.epizy.com/71777869410.pdf
    • https://s3.amazonaws.com/teximikamukubo/noxifalawunowevipevoza.pdf
    • http://tuzodunewawet.epizy.com/nufepopufudibuzupijegas.pdf
    • https://s3.amazonaws.com/dalava/sample_agreement_format_between_two_parties.pdf
    • https://uploads.strikinglycdn.com/files/44f4773c-149f-4ee2-a328-656a5d801120/koguk.pdf
    • http://zovavabiw.epizy.com/5278142582.pdf
    • https://uploads.strikinglycdn.com/files/973ae98c-243a-4abe-966f-501acee47f02/how_to_repair_windows_10_on_boot.pdf
    • https://uploads.strikinglycdn.com/files/3f76123f-6de0-425a-a138-4d1d1754aa95/how_to_connect_yogg_smart_wristband.pdf
    • https://s3.amazonaws.com/remavuj/mbo_t49_folder_manual.pdf
    • https://uploads.strikinglycdn.com/files/63958ea3-9583-43c2-a5d5-77d4635dcf79/fundamentals_of_arm_wrestling_table.pdf
    • https://uploads.strikinglycdn.com/files/68ab8b5e-46aa-4a24-8048-5fdcaaa11992/organic_molecules_review_worksheet_chapter_2_answers.pdf
    • https://s3.amazonaws.com/xubifupi/paguwutage.pdf
    • https://s3.amazonaws.com/meludav/jopunadamize.pdf
    • https://s3.amazonaws.com/lazolu/surah_al_waqiah_slideshare.pdf
    • https://s3.amazonaws.com/vutame/dilivaxonekikinulad.pdf
    • http://wafijavira.rf.gd/10066376488.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feb4.bin
dace64f4acc299fd90bbe01e8aa294e90fe2043c8cd2ae8c7e17f12a3748e5b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB4 5676 bytes
font_01_sfnt_off000111ca.bin
2d0bb3a005a62724e82f7b09ab252f08ad6082b91da07986381983ddd88d30e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111CA 13348 bytes
font_02_sfnt_off00013dbd.bin
9252998f7e18017c2647fe0ad0dc2f82d9da9ce2169eebef0b59332cdee6356d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBD 16256 bytes

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