Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55db25b28b20481…

MALICIOUS

PDF

71.4 KB Created: 2021-03-03 12:18:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 058a477024451395a9efd4f9a75b6709 SHA-1: 5a452be331a0df2ba5be3e9b734ade0652f55df2 SHA-256: e55db25b28b20481c203836d22aaa7cd9e4e2f5c00903c3ac79da099adbf5f3f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for link farming or directing users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/strik?utm_term=speech+therapy+games+for+high+school+students PDF link annotation
    • https://cdn.sqhk.co/vifejoneses/hiAgdMo/the_farmer_in_the_dell_child_song_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/kitijorawul/04SHo8k/the_walking_dead_season_1_full_apk_download.pdfIn PDF document text
    • http://kigazuvunawolux.iblogger.org/18909467723.pdfIn PDF document text
    • https://sewetinupas.weebly.com/uploads/1/3/3/9/133997680/radofodir_waziweruku_voxevixu_zijoje.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/fDghjhk/birthday_cake_celebration_images_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/afghiuE/43027352459.pdfIn PDF document text
    • http://kovajofi.iblogger.org/davapukapikupo.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/ghjh5hj/veveromuw.pdfIn PDF document text
    • https://cdn.sqhk.co/tixukiko/fibbuii/lyric_video_maker_apk_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://denuvifateve.epizy.com/revelation_song_piano_solo_sheet_music.pdfIn PDF document text
    • http://bajokekez.epizy.com/chevrolet_camaro_zl1_performance_specs.pdfIn PDF document text
    • http://xezerubewuxa.epizy.com/real_mathematical_analysis_pugh_solutions.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_off0000d896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD896 5776 bytes
SHA-256: 4e0721ba3714f731818f27cd9b8931aa02fd3318ce01c911ae399d414a74634a
font_01_sfnt_off0000ec1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 10748 bytes
SHA-256: bacd0f438dc7c7fb78c632c35f51c30e0ed43d04908c94fc9e23752bf9c4cbe8

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