Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4795c53303f164…

MALICIOUS

PDF

73.0 KB Created: 2021-04-24 12:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 093849376d59545e14704251ffda6740 SHA-1: dd1db250ac53344c16c60753e4c4c00113fe4701 SHA-256: ef4795c53303f1642c136911bf37d721a77ac096598e20ca900938f93825ee8b
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'resalured.ru', which is suspicious and likely used for phishing or to download a secondary payload. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to trick users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=free+printable+math+pages+for+2nd+grade PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495999/normal_6002d2a78c08b.pdfIn PDF document text
    • http://butinejijobu.iblogger.org/jikilovo.pdfIn PDF document text
    • https://cdn.sqhk.co/norejasiwiza/jnUhieK/68566391512.pdfIn PDF document text
    • http://shop-kid-toys.online/kopufimozukvt55.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/jiexidY/wildblood_apk_full_version_free_download.pdfIn PDF document text
    • http://skidki-day.store/how_to_reset_ematic_digital_converter_boxw2iml.pdfIn PDF document text
    • http://bestplacefor.rest/7992019886u1h9g.pdfIn PDF document text
    • https://cdn.sqhk.co/jopuromug/sUJHhi2/final_fantasy_crystal_chronicles_switch_local_multiplayer.pdfIn PDF document text
    • http://golden-charm.ru/35128249225kp6z1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vekagurose.rf.gd/what_is_the_coldest_state_in_the_us_right_now.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/the_other_side_of_heaven_2_dvd_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/bona_hardwood_floor_cleaner_msds_sheet.pdfIn PDF document text
    • http://waxaravibew.epizy.com/paper_flower_template_cutter.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/calcifying_epithelial_odontogenic_tumor_case_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/suwisirikarebojemuvefu.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/house_of_cards_s01e01_script.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_off0000ddd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD4 5684 bytes
SHA-256: 417155ea1efc0f6c26554f100849791a779e75c6a350754f6636613b20a950e3
font_01_sfnt_off0000f0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FA 11044 bytes
SHA-256: 0bb8303290b447d4f14f5b82d97637cf7bac917801143fff588be5aaf8d9656c

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