Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4baaab94d21394…

MALICIOUS

PDF

75.2 KB Created: 2021-04-04 08:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f71583642f1dc246564f86ecd5d18399 SHA-1: 638ad8d5141fb38f2caf4f2d228871f3327fcaf7 SHA-256: 9e4baaab94d21394a927c5a4fa7d158e133cd84983209b88beb4a490e157c8e4
66 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that lead to link farms, with one specifically using a 'utm_term' parameter suggesting a tracking or redirection mechanism. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs indicates an attempt to direct the user to potentially harmful content. Although no scripts were extracted, the overall structure and heuristic firings suggest a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://leonvi.ru/strik?utm_term=dunkin+donuts+bagel+nutrition PDF link annotation
    • http://rexapeduke.66ghz.com/flowers_bouquets_pictures.pdfIn PDF document text
    • http://lukisasore.mywebcommunity.org/23202190629.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393925/normal_5ff7f8d24ff96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490934/normal_605072094c8e8.pdfIn PDF document text
    • http://gexafozo.22web.org/south_africa_a_modern_history.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415309/normal_6009ddbfa6354.pdfIn PDF document text
    • http://arboozfilm.com/xupejikorujewuo0rbf.pdfIn PDF document text
    • http://tonagruz.ru/magonagoreduwirasutos8dfn5.pdfIn PDF document text
    • http://tortomsk.ru/51089402304bdfcg.pdfIn PDF document text
    • http://mavixepajifulem.scienceontheweb.net/technical_drawing_standards_iso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491673/normal_5fd833100ed64.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_6c4543b2d3b64d14968ac4dd4a715535.pdf?index=trueIn PDF document text
    • http://luxupovokajaf.onlinewebshop.net/que_es_aprendizaje_social.pdfIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_a624d74654ff4d9f9186eb732798f3e3.pdf?index=trueIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_c13c5d7e867d4059a82e67691625a4c4.pdf?index=trueIn PDF document text
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_39057b8649b544dc8200b0a976a2d867.pdf?index=trueIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_e038381f37394b689ea2e044d56333e2.pdf?index=trueIn PDF document text
    • http://wepinipinalojud.epizy.com/51611413331.pdfIn PDF document text
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_175f29294a9740b2ac4c999479442e38.pdf?index=trueIn PDF document text
    • https://814bd5e1-0b6f-40f8-b2e9-6ab0015c5eef.filesusr.com/ugd/cc77ff_bc6b3ccb168f40578758eef423fca617.pdf?index=trueIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_f5536b259a30495287589a36e4fd730e.pdf?index=trueIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_0fb72588d25649578d8533c001d3e41a.pdf?index=trueIn PDF document text
    • http://vaxalisuj.rf.gd/agency_theory_and_internal_audit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5A 5076 bytes
SHA-256: 4a8b8318e8a09335fa415ed3fc8ef19f03889a948d2a8126fa0ea4887dadc6fd
font_01_sfnt_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 10696 bytes
SHA-256: a151f062aaceb095136b6b7c8383ebdae70eb354de0717e86b3c31938f22e9fe
font_02_sfnt_off00011154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11154 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2