Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e58265776ed80d…

MALICIOUS

PDF

75.4 KB Created: 2021-03-02 02:01:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9eecd50eede798c57a487cd8a9061f06 SHA-1: 25f5d15941e3f21e7bbaf52e9d2636eedc2eb9c4 SHA-256: 71e58265776ed80df5b0a4e2ae949b17984a053c9676c2bdc7b0214940045eab
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'pelibifir.ru' with a 'utm_term' parameter, suggesting a phishing or redirection scheme. The PDF also functions as a link farm on disposable hosting, further supporting its role in directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://pelibifir.ru/strik?utm_term=medical+surgical+nursing+test+bank PDF link annotation
    • http://wedipum.mygamesonline.org/dowoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459477/normal_5fcea2abe6ee7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447631/normal_5fd10bf0764bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473642/normal_6011e417b3885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392647/normal_5fd6582dbdd11.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/lonulowarukiwafej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460465/normal_602fd93761538.pdfIn PDF document text
    • http://davupopebuwiser.sportsontheweb.net/the_fisherman_mourned_by_his_wife_summary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_602248e53df62.pdfIn PDF document text
    • http://xibawolafubiz.getenjoyment.net/tunafaxakexosofaliwarumi.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/mejores_cursos_de_ingles_por_youtube.pdfIn PDF document text
    • http://wasatosu.sportsontheweb.net/albert_beveridge_the_march_of_the_flag.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/is_international_mail_coming_to_canada.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/vawoginele/pdf_to_word_mac_automator.pdfIn PDF document text
    • http://dupofax.rf.gd/business_card_template_psd_vistaprint.pdfIn PDF document text
    • http://rigidafavubo.myartsonline.com/zokipudelolideti.pdfIn PDF document text
    • http://luxoxuwaf.epizy.com/koratukewoduvosesixol.pdfIn PDF document text
    • http://xotexipu.rf.gd/17831342932.pdfIn PDF document text
    • http://mugudupo.epizy.com/gofadap.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/jawedilelutevutegiwize.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_off0000ea57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA57 5316 bytes
SHA-256: 26150f49856f2a876d4bbe4e384f440a6d190345e19a49ca1e7738b05310d9d8
font_01_sfnt_off0000fc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC80 10540 bytes
SHA-256: 67bd05da2bc29651e3b8369423f735e9f6e03edb50a3dedc3908c119ecdc514b

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