Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1488e5aaa5132b…

MALICIOUS

PDF

76.9 KB Created: 2021-03-13 15:15:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2d5ba0eaee38bf83ea83b7322d60951e SHA-1: a573377d7dbe11a62f05a9892c69dab20a9ed872 SHA-256: 7c1488e5aaa5132b523de175013f3b872ce7ee96f13ebcd92832fdd2eae41e81
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm designed to redirect users to various websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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.
  • 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://botokaw.ru/award?keyword=metro+map+pdf+download PDF link annotation
    • https://cdn.sqhk.co/ruzewekafan/ekcHvhc/dual_monitor_backgrounds_4k.pdfIn PDF document text
    • https://fepobiwebefu.weebly.com/uploads/1/3/4/5/134592484/78705f94e37.pdfIn PDF document text
    • http://parovosi.mygamesonline.org/hoover_steam_cleaner_replacement_pads.pdfIn PDF document text
    • https://mawafusujomadil.weebly.com/uploads/1/3/5/3/135351104/871d77b3398a.pdfIn PDF document text
    • https://cdn.sqhk.co/ridijafugemi/geIjgQV/fefobuzolizurozojipuluxe.pdfIn PDF document text
    • https://gusoberususot.weebly.com/uploads/1/3/1/4/131454899/putikogaseja_juwewudebi_ridaw.pdfIn PDF document text
    • https://cdn.sqhk.co/gesaxamadew/hd7eZOR/42096885109.pdfIn PDF document text
    • https://lubikumak.weebly.com/uploads/1/3/1/4/131453733/baxagoxugotimi_sadutavujikuf_jovetunenuk.pdfIn PDF document text
    • https://cdn.sqhk.co/junizafuzep/4qDhjts/lawupozexexaduji.pdfIn PDF document text
    • https://jeletaru.weebly.com/uploads/1/3/5/3/135321400/wasobuxizow_rijafidap_gidimatez.pdfIn PDF document text
    • https://getesedalo.weebly.com/uploads/1/3/4/6/134629657/1709370.pdfIn PDF document text
    • http://warewakeb.sportsontheweb.net/basketball_court_drawing.pdfIn PDF document text
    • https://livafuti.weebly.com/uploads/1/3/4/6/134628119/kozuviwat_dawefe_xolesetawide_mipoxerofoz.pdfIn PDF document text
    • https://cdn.sqhk.co/jidelugob/IghhQhb/kanetakidavi.pdfIn PDF document text
    • https://mitojebani.weebly.com/uploads/1/3/2/7/132711961/wuliwibixadova-timol-jufeta.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/839478.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/kevava/jupemawajixarurem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff92e131-0288-4c0a-87c1-f0baef6826f6/core_java_interview_questions_for_3_years_experience.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79f379b5-9da5-4d88-acc4-778f6eca7b26/vagetogewatapivefalimig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75ed2dbe-019b-4102-b1d1-8602ee825088/emergency_medicine_physician_jobs_miami_florida.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/sukkur_board_result_9th_class_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/chehalis_sheet_metal_heating_and_cooling.pdfIn PDF document text
    • http://romofimor.onlinewebshop.net/4830724047.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/pezovujunixixej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc69552b-77f4-44d2-a64e-ef937b233db0/gopalodeloji.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/tipping_point_malcolm_gladwell_sparknotes.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_off0000ef0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 5108 bytes
SHA-256: c0f0b81dfba7c4c4aa7f5d82d7aed37a23121c0a0f35e08f5d1e5cb3f2acfe87
font_01_sfnt_off0001006f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006F 10652 bytes
SHA-256: 9ea590da9c0609c9b01872db602643071dc1f4df52f52aaab17375e0cc4d7fa7

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