Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c84920ee722abe…

MALICIOUS

PDF

73.4 KB Created: 2021-06-08 23:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 755b673e91da414f12ec29470fb94020 SHA-1: c97c6daa18bddb15e124785438bb6c6c35ed50b8 SHA-256: 48c84920ee722abe88fb8c8b1aabe47d65632430e397725198372100834f014e
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/pbw?utm_term=dividing+fractions+worksheet+6th+grade+pdf PDF link annotation
    • https://megafibi.weebly.com/uploads/1/3/4/3/134347288/4423744.pdfIn PDF document text
    • https://wagetuve.weebly.com/uploads/1/3/5/3/135323282/5885623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469836/normal_601f2795aedbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502493/normal_5ffa68317efd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452595/normal_606e9fb3a7b74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383471/normal_60b85468a205b.pdfIn PDF document text
    • https://buwumesuja.weebly.com/uploads/1/3/5/3/135303403/zasun_tilazekilinar_niwofit.pdfIn PDF document text
    • https://jutoxanifi.weebly.com/uploads/1/3/5/3/135321179/5714681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470964/normal_601647db7fd2e.pdfIn PDF document text
    • https://teditiwos.weebly.com/uploads/1/3/2/6/132681477/fuvuvibatokawof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cff3e30-7bca-4e33-856a-a7efce8390cb/multiplication_as_repeated_addition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f0de5e5-8d74-4f4d-b356-09e84a6d59c1/what_to_do_when_your_portable_charger_stops_working.pdfIn PDF document text
    • http://xovelezid.pbworks.com/w/file/fetch/144416778/what_is_the_average_salary_in_sri_lanka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/566af65e-b414-4ae6-a849-94626620bc0c/gafesinusorolekelekebaw.pdfIn PDF document text
    • http://jeselivid.pbworks.com/f/lonijetakokuzikiziwiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f30fe67-9428-4928-b387-354a76a82641/42519678520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1eaee46-319d-4e5d-a9a9-0e76dae9ab93/30645551480.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/w/file/fetch/144413721/majaguvusobobaxuxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba22c991-1e82-4b12-bdd5-3ad1f85f61ca/what_is_the_best_way_to_do_trading.pdfIn PDF document text
    • http://xodelow.pbworks.com/f/2520837217.pdfIn PDF document text
    • http://bupataved.pbworks.com/f/bonumiduna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0a0175a-05b6-4b34-ae75-b338414b6bc1/sample_covid_safety_plan_for_construction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c5b09ec-dd96-4268-93d9-f53cdb3eecfe/vusasatugusajiliv.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/w/file/fetch/144667104/is_danielle_and_adam_divorce.pdfIn PDF document text
    • http://jilawuxifi.pbworks.com/f/exercicios_resolvidos_de_quimica_9_ano.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144427944/solving_exponential_equations_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d6c4d99-981f-4e6b-ab0c-4b581f7fdf65/selolenabagoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c288813-2e90-45cd-b40d-d6309a14353e/44466482482.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_off0000e167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 5752 bytes
SHA-256: eb949aa2410e03f0b1c2f4e87177309456c8a0c7ee4c378f6c06360506be1c9d
font_01_sfnt_off0000f51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 10104 bytes
SHA-256: 9da44f2554b071edcc11b3abedc92e09c857550c634121eca7ed53b80b993b44

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