Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f0306d21f9d38d…

MALICIOUS

PDF

80.0 KB Created: 2021-04-20 12:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f18c94d8f274e9574e06f4231b4fe20d SHA-1: 74e862adb17f1004413742e31c66d5db0388586d SHA-256: 90f0306d21f9d38dd9878d9d64a86ffd094cb562300ccfbacf7e1b6dd32bb217
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URI heuristics point towards an attempt to redirect users to potentially malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://nipisod.ru/strik?utm_term=how+much+does+g+shock+watches+cost PDF link annotation
    • http://riwotivadejud.sportsontheweb.net/variable_expressions.pdfIn PDF document text
    • http://nuverlites.online/how_to_replace_stove_drip_pansviep9.pdfIn PDF document text
    • http://xilibinebosapeg.mywebcommunity.org/tipos_de_asientos_contables.pdfIn PDF document text
    • http://wobafobigo.mywebcommunity.org/what_is_utilitarianism_theory.pdfIn PDF document text
    • http://getcreditcheck.info/bible_niv_app_for_pcasb8q.pdfIn PDF document text
    • http://zespodsvetkoy.site/setuxadebozirajefawie7n.pdfIn PDF document text
    • http://fobexugelego.getenjoyment.net/26687962429.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/vuxagixil/mental_health_assessment_report_template.pdfIn PDF document text
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_6140ef6bf1e3463baf24bf6d0c9a6844.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcba5dd3-2285-456a-9a5a-4b613b793e9f/88493734415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3981d6c-e85c-42af-94d6-e7b501911b16/67630315870.pdfIn PDF document text
    • https://e05bdd54-7536-4db1-b7ed-110d7b12163e.filesusr.com/ugd/dd5a80_b9e5fff1bd6742d191908db364518aae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/lizojut.pdfIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_8d04da8b988143d0990b545adc7613f1.pdf?index=trueIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_e0850cc2f04e4d61b3fc6ad35cdce345.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/66741054835.pdfIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_fab64c6a4ab5426eb131d881e1294dc9.pdf?index=trueIn PDF document text
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_9c1132c04a66489a8a6b8c35cc6e4dee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ce3dab6-91c9-4375-b8be-0562fd7d0249/81660497056.pdfIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_2e02b34d3a0f41b8941763dba2945cb6.pdf?index=trueIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_004273ae353d4c489165601cc6de5a67.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sitozi/92775011844.pdfIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_e6c15b44fe8c479f9253b8b6bac53725.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/971aecd6-23be-42af-9bc3-ccd081476814/o_que_fazer_para_acabar_com_as_espinhas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6072792d-2374-4808-a9ba-207cf6ec815c/the_country_similarity_theory_would_be_useful_to_explain_international_trade_in.pdfIn PDF document text
    • https://8084a2ae-6cfb-493d-8155-0d4219c0f7e3.filesusr.com/ugd/5b3528_fd0b1017874b4408a6fc99579ecc714d.pdf?index=trueIn 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_off0000fac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC4 5340 bytes
SHA-256: eec140c5c4e57b57bced809113042ddc630876ee1f245cca4aedec6d01d58b21
font_01_sfnt_off00010cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDD 10972 bytes
SHA-256: ff75e27edf7c9466704e38567be37a1ecfe8e0bb6d183cda4fd74f499955523e