Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f73f3f166cac258…

MALICIOUS

PDF

73.6 KB Created: 2021-03-03 21:44:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: cf8b45ce7c01ababa90d91b8a23ee285 SHA-1: d941d7654f18f1d1d94f3d0c0d31e77db03a73b9 SHA-256: 0f73f3f166cac258d9037e0dfadac61ab1a2cd463bb77a9e5a1c2b15770db4b2
184 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link to known malicious infrastructure. The PDF contains numerous embedded links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=superficial+front+line+exercises In PDF document text
    • http://ziwigosopijulal.mygamesonline.org/is_usc_required_sat_for_2021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_6018869aa6f7e.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/contabilidad_de_costos_industriales_ejemplos.pdfIn PDF document text
    • http://komozazene.getenjoyment.net/how_do_you_punctuate_with_quotation_marks.pdfIn PDF document text
    • http://gofidiva.iblogger.org/18030710559.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/ms_access_2007_query_tutorial_ppt.pdfIn PDF document text
    • http://finoginujowiwi.mypressonline.com/64504144687.pdfIn PDF document text
    • http://gufurebu.medianewsonline.com/download_the_bible_for_free.pdfIn PDF document text
    • http://rijigikesezaga.mypressonline.com/what_gear_should_i_put_my_bike_in.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485172/normal_601e07e6532bb.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/dixalovuzonavirofi.pdfIn PDF document text
    • http://xolokukifimiv.sportsontheweb.net/26865367266.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/resabomibogodaw/aortic_abdominal_aneurysm_guidelines.pdfIn PDF document text
    • http://rugokabiko.epizy.com/wunibojeribij.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/50499826711.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/fumetiwukidujetiwokam.pdfIn PDF document text
    • http://donijexufenu.onlinewebshop.net/what_is_non-realism.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/transforming_rectangular_equations_to_polar_form.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/lymphoma_contouring_guidelines.pdfIn PDF document text
    • http://xomapagovujux.atwebpages.com/76795044674.pdfIn PDF document text
    • http://vorakufi.epizy.com/xurojazijitodezirunodu.pdfIn PDF document text
    • http://nifiloxoburufi.rf.gd/article_370_bare_act.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_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 5180 bytes
SHA-256: d67063b47e69b8bddacde6dd8771950667ee87589e1c3a63b31cdf0a8aa8ea45
font_01_sfnt_off0000f5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CD 10276 bytes
SHA-256: 7e971d28288f14412df12b195e05f73cdf4b26647e5bb93e091e47cf82028b08

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