Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab5d07600f651c9…

MALICIOUS

PDF

74.0 KB Created: 2021-04-01 06:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb2b2040c36c0d9f479be55a73d97be6 SHA-1: a934738bb1f8a1ec43232b059e776538e6f1d1ea SHA-256: 5ab5d07600f651c9fccbaa8c2f2bb2e603882d3c54c419e1b7b4b2b6233db886
156 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The PDF contains numerous external links, with one pointing to 'https://vilenefex.ru/wix?keyword=idiot+test+2+unblocked', suggesting a phishing or malware distribution attempt. The presence of embedded PDF links and the overall structure indicate a link farm or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/wix?keyword=idiot+test+2+unblocked
    • https://cdn.sqhk.co/bikakigiben/hVYHcih/budibefironizal.pdf
    • http://kelnoteres.xyz/gomegisazewefanukedovur49sow.pdf
    • https://fojevatiseme.weebly.com/uploads/1/3/4/4/134400043/duzepanoz-pukateravolo-nokovuxefowataw.pdf
    • https://belujewirozem.weebly.com/uploads/1/3/2/6/132681559/ad96cba8ad.pdf
    • http://karaulovlife.site/123318784945ll3n.pdf
    • https://cdn.sqhk.co/sadudolamom/ehgLdhf/marketing_plan_presentation_ppt.pdf
    • http://gebevojika.mygamesonline.org/xazuzi.pdf
    • http://fobexugelego.getenjoyment.net/95366219351.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pipaneku/livro_de_malaquias_hernandes_dias_lopes.pdf
    • https://s3.amazonaws.com/sasufufa/black_fitted_crib_sheet_canada.pdf
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_58c3b2fa4aa7441a95e31b9a36d63cdb.pdf?index=true
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_130950a112cb4b259362aa9318ffc2cc.pdf?index=true
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_77c283fe4505413f9a3ce24f976426fc.pdf?index=true
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_e7a67ec5675c4a48999c864d42d50141.pdf?index=true
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_9139df73e055455ca3a600c704bd8dbb.pdf?index=true
    • https://s3.amazonaws.com/vofadoloves/afasia_motorik.pdf
    • https://s3.amazonaws.com/bodajaku/fitixomafeme.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_off0000cf7d.bin
80f206d999fb901d790fc463875d99bd1eee64adc57beb91f5364fdf9b96a61b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7D 4900 bytes
font_01_sfnt_off0000e03e.bin
e53730e267554bea624d8c41d45e5c35231d9952bb80904e39c9f767db2d4ac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE03E 10676 bytes
font_02_sfnt_off000104ee.bin
5d3472595fb2ad6b8437ad79ce964bf56c3a2675fdba68f45749f90a56c5fd5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104EE 16620 bytes

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