Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0e68146e98df42…

MALICIOUS

PDF

81.6 KB Created: 2021-03-23 18:44:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7cebad347659be5ba56ae235b09eb7c6 SHA-1: 1180ea84bb24db323ee48660552a6a6b1b936c85 SHA-256: 4e0e68146e98df4204c3e44605c3c76695f14d1efb4d43cfcd0fc2f607982069
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and redirector infrastructure, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious websites for credential harvesting or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/123?utm_term=hypertensive+retinopathy+guidelines+pdf In PDF document text
    • http://mokaxizekebade.scienceontheweb.net/fotidaxebe.pdfIn PDF document text
    • http://mopexaxurip.getenjoyment.net/windows_batch_file_reference_variable.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/geHsvij/fifepukutijuvuxonosa.pdfIn PDF document text
    • https://timigotevawil.weebly.com/uploads/1/3/5/3/135329967/zagiduganugibuni.pdfIn PDF document text
    • http://lotukaguw.sportsontheweb.net/ano_ang_bionote.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/bajaxelimalogotep.pdfIn PDF document text
    • https://cdn.sqhk.co/zifalulog/hchigfb/server_rack_accessories.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405414/normal_605070b7ee6ab.pdfIn PDF document text
    • https://pezumebudoko.weebly.com/uploads/1/3/4/6/134681460/wowarizu.pdfIn PDF document text
    • https://cdn.sqhk.co/pulurune/kU5hh49/any_call_center.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477615/normal_5fd06e31ad3e4.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://uploads.strikinglycdn.com/files/d1293f95-d517-40aa-ae0c-12d0ad4beadd/rosuwasibazamipezejas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e39f33f2-9d86-4e4a-aa7b-00eebac2703f/how_to_change_xfinity_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/speed_queen_error_code_e_tp.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/semicolon_worksheets_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1749f1b5-48fa-4c14-b712-91101044d008/kenmore_80_series_washer_timer_knob.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_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 5308 bytes
SHA-256: 6506304af8b1e612e0937842569ec24dad5b353ef59387ac6c44e81ef18dad72
font_01_sfnt_off00010359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10359 11664 bytes
SHA-256: ea0ac6e0be0d570a4d3a5d7e9ce0a790971d272a1295ace89becee61d9115aec
font_02_sfnt_off00012b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B03 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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