Malicious PDF — malware analysis report

Static analysis result for SHA-256 c458e08696cb4df1…

MALICIOUS

PDF

71.4 KB Created: 2021-03-10 15:15:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 52343238199f76d68a90ad59e4bd6732 SHA-1: 5add68785ad81f4b9b54ee295450d0a9da503b3e SHA-256: c458e08696cb4df111fbc5872c035a9fd548d19c589963806b298bb66a4bc05f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://seumenha.ru/award?keyword=livro+cabala+pdf PDF link annotation
    • http://topcreditscore.info/470361817753i9ty.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445550/normal_6043ba97d85d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379856/normal_6046833635fe3.pdfIn PDF document text
    • http://edayafar.xyz/462359536960y4vd.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/buah_merah_side_effectsl82gx.pdfIn PDF document text
    • http://latencfsrt.space/anyone_can_cook_bookfnfx7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481540/normal_5fcf12424aa30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414486/normal_602e0820490be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367013/normal_6002786d57eb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467561/normal_6022835320d27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462775/normal_5fee6b0351b2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483604/normal_5fcbe41e43e05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413845/normal_60165f65c99da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420434/normal_60287488900ec.pdfIn PDF document text
    • http://verifybadgehelp.com/baby_trend_sit_n_stand_lx_car_seat_adapterpw3jc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374021/normal_600cb94be1f27.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_9d1579cb92e14e9098e7547a28b1be19.pdf?index=trueIn PDF document text
    • http://nipuxedexup.epizy.com/what_tense_should_the_introduction_of_a_lab_report_be_in.pdfIn PDF document text
    • http://xadamun.epizy.com/ritavewirafelekadawiremiz.pdfIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_4497b0f31a214920a154ffab5a9ea2de.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_off0000d589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD589 5112 bytes
SHA-256: 0d6f2257072cfae79823055b881fdd2ac73ab65965a40784a2708994deb1e225
font_01_sfnt_off0000e704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 12764 bytes
SHA-256: 0806833b4cf6d9e71e82f44373e24cc8507672ae74eab409d6d213a52fad7dce

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