Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc4572a28882acd…

MALICIOUS

PDF

75.4 KB Created: 2021-02-28 01:23:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f1161ece18c8f9df45d17bd46c3939c7 SHA-1: d056df85a0905a6e238abc1c99824faf7de19cb5 SHA-256: 9fc4572a28882acd728b3adb87d37cbb04fe6fe644f568ca4cff0d015f5f2b22
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://pelibifir.ru/strik?utm_term=how+metric+units PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421050/normal_5fc9aca8548b8.pdfIn PDF document text
    • http://copyrighthelpcentral.com/marx_capital_penguin_classicsajoao.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471941/normal_5fc802a6375bc.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/rome_total_war_2_unit_size_modrrk47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383918/normal_5fd318a870de5.pdfIn PDF document text
    • https://woduluzotuni.weebly.com/uploads/1/3/4/3/134373450/lavowupi.pdfIn PDF document text
    • https://jadetikoj.weebly.com/uploads/1/3/5/3/135350844/2575562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402504/normal_600eb6c2644ae.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/cheapest_place_to_buy_one_touch_ultra_test_strips.pdfIn PDF document text
    • http://pixelbarista.com/xilevakezepovosusuwajedenr6jv.pdfIn PDF document text
    • http://chebsvet.ru/jerry_kuhnhausen_mauser8cfvw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kofaxafogi.myartsonline.com/basic_electrical_engineering_vtu.pdfIn PDF document text
    • http://kopolug.myartsonline.com/propiedades_mecnicas_de_los_materiales.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/44597906515.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/cnc_simulator_app_for_android_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/40456297996.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/nsfas_bursary_application_form_for_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/78142366416.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_off0000ebad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAD 4756 bytes
SHA-256: 2dccb66f6aadafbff49381e40b3ff18dd69cf9322aca159c2cf949200e0bd155
font_01_sfnt_off0000fbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD3 11168 bytes
SHA-256: bacf41b477131dfcfd8c6d27de7f97c989439cda28cf5eacde09b5f8b6066cf5

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