Malicious PDF — malware analysis report

Static analysis result for SHA-256 025865d7f731cfa8…

MALICIOUS

PDF

79.8 KB Created: 2021-04-05 15:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c195eb86a0369659c2e10e639ae3cb0e SHA-1: 89f00004228314e7c28a20086fc346238eb8bd3a SHA-256: 025865d7f731cfa8ab6ffd489b16cbeb59a5547013464db4e46651105d331de9
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://kuzutuzo.ru/award?keyword=penatalaksanaan+pneumonia+pada+anak+pdf PDF link annotation
    • http://wejuzofibab.medianewsonline.com/mevifiwezu.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/povazokizovukokomatevidaz.pdfIn PDF document text
    • http://konufij.22web.org/tabel_99_asmaul_husna_beserta_artinya.pdfIn PDF document text
    • http://sijojovimem.22web.org/taxir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_c17f7f7a5bb4466e9f162f7a1e371c04.pdf?index=trueIn PDF document text
    • http://xurosuforudev.atwebpages.com/what_are_the_stages_of_human_cultural_development.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/lagu_aishiteru_banzai_maki_ver.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/ak_47_bandook_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/nelutoroforusezot.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/67121089327.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/92060993546.pdfIn PDF document text
    • https://7605c768-a471-4169-85a9-0dab509fd250.filesusr.com/ugd/20ab23_a3b95d169d1743e1921e389b02b52e54.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pobixedele/xunobuzosixag.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/music_sheet_reader_app_android.pdfIn PDF document text
    • http://vipuzala.myartsonline.com/mitaxeterex.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/88525203100.pdfIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_750e7c8a4c454078ad06d87e19182ed3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/ar_camera_app_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/faronowevipexivunitodakir.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 5036 bytes
SHA-256: 55d65b222aaf16b6cd414df57fedfe2b3f93c6e68f749a90b0172e7ead6da9e1
font_01_sfnt_off0001007d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007D 10232 bytes
SHA-256: d74ff492d733cb51da26b76b917be71ae53335194390d695dbfd1017377d2da0
font_02_sfnt_off00012393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12393 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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