Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b3f54b752c0487…

MALICIOUS

PDF

76.4 KB Created: 2021-02-11 01:11:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 11f41c5e02740e81f8a611031839f594 SHA-1: 74a1060d0875a4e798bd05ba7ba03306f84135e9 SHA-256: 52b3f54b752c0487973558a0a5678352ce039137f32ad3eef2c1d09afc34d2af
136 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristic firings indicating malicious intent, specifically related to phishing and potentially executing commands. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF. The presence of external URIs and the 'SE_LOLBIN_RUN_COMMAND' heuristic indicate an attempt to download and execute a secondary payload.

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://leonvi.ru/123?utm_term=signing+naturally+unit+9+10+answers PDF link annotation
    • https://cdn.sqhk.co/rubupidorinu/V70jdia/large_venus_fly_trap_plants_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_602108d8b3a15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381539/normal_600a238911c92.pdfIn PDF document text
    • http://hook-up.fun/jopukiferasogupumaaodvh.pdfIn PDF document text
    • https://cdn.sqhk.co/ribegibonot/5Jeohan/xbox_360_guitar_hero_controller_with_rock_band.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/UJA4hcp/prix_installation_electrique_maison_100m2.pdfIn PDF document text
    • https://cdn.sqhk.co/tesadubozino/vciehhg/vopibawolimobopo.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/GEVghqe/color_me_hip_hop_coloring_book.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/cJiboig/railway_app_download_karna.pdfIn PDF document text
    • http://dezlice.ru/kodable_app_for_pcmd337.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401989/normal_5fdff0ab4bb67.pdfIn PDF document text
    • https://cdn.sqhk.co/vedisaso/gMnphcl/sejazoxidogosesonesaburo.pdfIn macro / runtime command snippet
    • https://cdn-cms.f-static.net/uploads/4426090/normal_5fdb87cd30f7b.pdfIn macro / runtime command snippet
    • https://static.s123-cdn-static.com/uploads/4444098/normal_5fe037eaaf1a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/440198In macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/11766296590.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/fuvazonada.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/christmas_label_template_30_per_sheet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD606 5500 bytes
SHA-256: dfac8cfb6a6207f8655ebf2b56703bcda25c4997b7ef507cc5dc515a5762952a
font_01_sfnt_off0000e8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DD 11260 bytes
SHA-256: 1052c52b23f22d86e8b1ac1ff9b33a7773a1dcf63024b0ffad4bf1122568ff65
font_02_sfnt_off00010ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBC 16324 bytes
SHA-256: e6d9021675d0d5757d7cc94b1ab24e42200d1507cad2986ba6eda9a0b14d2703

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