Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4fce512cd5c94f…

MALICIOUS

PDF

87.0 KB Created: 2021-03-08 15:32:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6f69bf29b07f7ba6619f9f740b6d0c6c SHA-1: 017c56af8e3e214a66c2a5e603e009038d199f79 SHA-256: af4fce512cd5c94f9d9419973e949d5045b5a552772298bf5b8d9f43739b5825
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to a suspicious domain, disguised as a search result for technical interview questions. The document body, though heavily obfuscated, appears to contain metadata related to the URL, suggesting a phishing or social engineering attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • 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://xajibur.ru/123?utm_term=angularjs+interview+questions+and+answers+javatpoint PDF link annotation
    • https://cdn.sqhk.co/sokulutesi/hhdwvDA/galaxy_star_projector_light.pdfIn PDF document text
    • http://goodshopsales.xyz/dagupamapepajafupeobg0a.pdfIn PDF document text
    • http://raicen.com/11336741252ctcel.pdfIn PDF document text
    • http://masalev.ru/what_is_the_best_4k_55_inch_tv4bhnu.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/jetMfYm/36697749541.pdfIn PDF document text
    • https://cdn.sqhk.co/dilobowuz/obwLhik/clash_of_clans_pc_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/dumadomizore/Ijfhjhe/wynarka_off_road_racing_2020.pdfIn PDF document text
    • http://lozhobelir.space/tom_clancys_jack_ryan_season_1_episode_4_castu48no.pdfIn PDF document text
    • http://gulidomirebo.22web.org/pekadibogixek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kodataruturi.rf.gd/commitment_of_traders_report_graph.pdfIn PDF document text
    • http://jefokid.rf.gd/john_deere_310a_backhoe_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/cuneiform_numbers_1-_10.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/77058427115.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/glencoe_science_biology_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/mariam_khan_reporting_live_mariam_real_name.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/wow_cataclysm_4._3_4.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/89668477812.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/wwe_crown_jewel_grades_bleacher_report.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/what_does_code_s0a00_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/2018_bi_monthly_payroll_calendar_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/58637254776.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/wezoz.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/pca_guideline_judgment.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001177d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177D 5468 bytes
SHA-256: 03ff798ee96fa1d865947a90bf87c0e503021001b8c8ceab4d861328fb70ca26
font_01_sfnt_off00012a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3D 10552 bytes
SHA-256: 569b740d6a6fe120c9c0e2e3310e44b411dc14d095dee1e24a535c14a6610d0d

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