Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b602b03edb29588…

MALICIOUS

PDF

81.6 KB Created: 2021-03-07 07:24:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 3a2de4baaf9e716adf23769eb61f45e1 SHA-1: 274881170700f53411e731ca41373232db43b4ca SHA-256: 5b602b03edb295885f071ec1ca84fd8c1bff2d9c4ac59bd3c3d13663f4ad79c0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to potentially malicious domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

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
  • 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://midufefew.ru/strik?utm_term=yamaha+rx-v863+hdmi+arc PDF link annotation
    • https://kovunigok.weebly.com/uploads/1/3/5/3/135317038/laromejoko.pdfIn PDF document text
    • https://xaxepilote.weebly.com/uploads/1/3/4/2/134265473/1804140.pdfIn PDF document text
    • http://instapriz.online/868745165540z5kh.pdfIn PDF document text
    • https://cdn.sqhk.co/xiladuxe/jd2Pies/rocket_car_racing_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/dunafafaxen/7iajhhi/potamepedojikidapumiwike.pdfIn PDF document text
    • https://cdn.sqhk.co/kabevapixox/cjijgii/history_pockets_ancient_civilizations_grades_1-_3.pdfIn PDF document text
    • http://shtangye.xyz/rerovolunuo5z4r.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/iaggieO/dr_driving_game_download_apk_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/jacv5je/super_car_racing_multiplayer_apk_pure.pdfIn PDF document text
    • http://freshka.fun/hayward_pool_heater_h400fdnasmehlnvc.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/WFuhfDV/ranks_in_the_british_army_officers.pdfIn PDF document text
    • https://cdn.sqhk.co/vefoveted/phifDVm/excursiones_cruceros_por_libre.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/44342620045.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/survey_answers_somewhat_agree.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/acides_forts_et_bases_fortes.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/87214742907.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/platform_wedge_heels_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/peavey_vypyr_vip_3_bass_review.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/62466266005.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_off0000fd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD24 5604 bytes
SHA-256: 907e8900ceff9dca421a15a55623c1d01bd70a254335c36f1779b00e4fdaf3a1
font_01_sfnt_off00011018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11018 12720 bytes
SHA-256: 2ae00de68d85719931ed2d4a6c0f1c5730ff1b9d4b8a7d522410c13848a176f9

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