Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64c2ff876c7fc4f…

MALICIOUS

PDF

82.8 KB Created: 2021-03-18 22:26:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 094017fef2e545704c0a08a08f8fb109 SHA-1: d4c80a63b13611e13318221c8cb305054b23178f SHA-256: e64c2ff876c7fc4fe4f2f6d15db536391034640ced9cd8603abfa79aadc31335
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple external URIs, including one pointing to 'kuzutuzo.ru', which is indicative of a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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 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://kuzutuzo.ru/award?keyword=lo+invisible+azorin+pdf PDF link annotation
    • http://forezofulafenu.iblogger.org/47171509901.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416125/normal_5ff7082c18686.pdfIn PDF document text
    • http://fofakowusagafo.22web.org/what_is_the_proeutectoid_phase_in_a_1095_steel.pdfIn PDF document text
    • http://form-lnstagramverifiedbadges.com/the_silence_of_the_lambs_movie_google_drivesb9sl.pdfIn PDF document text
    • http://taxilozevuj.iblogger.org/secured_not_printing.pdfIn PDF document text
    • https://jatevabuxises.weebly.com/uploads/1/3/5/3/135382810/7d9d03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382618/normal_5fdf9af296c8f.pdfIn PDF document text
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/f74a4ce4f6cd3e2.pdfIn PDF document text
    • https://todijaxazifaro.weebly.com/uploads/1/3/4/3/134342800/pakam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409394/normal_600fed7ee9d09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451352/normal_602253e8675c5.pdfIn PDF document text
    • http://bonus332.site/seneca_on_the_shortness_of_life3yyy2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458161/normal_604cd13b0355b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://setevibebevu.epizy.com/pennsylvania_mandatory_reporting_laws_elder_abuse.pdfIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_773c8298a5574a8f8ccefb51d8f97c41.pdf?index=trueIn PDF document text
    • http://bozumux.epizy.com/beatless_light_novel.pdfIn PDF document text
    • http://vobuxex.epizy.com/quarterly_taxes_california_forms.pdfIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_6a3558107193417287692f9f7049b33d.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_off00010432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10432 5228 bytes
SHA-256: 0760191a9a0fb9e98dddb1656615ec50c15174e89e909e87bb174a9df7e434ad
font_01_sfnt_off00011615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11615 12340 bytes
SHA-256: 465e5bda07367d85d059f1d21014c42f9a9e2ecd54865baafdb02877376659d4

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