Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3c8658b7074967…

MALICIOUS

PDF

69.9 KB Created: 2021-03-05 09:43:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 694bebdbc0e8b86d367b7ca5188344e2 SHA-1: c448d964f97da52440d00e5f334430ff75e04155 SHA-256: fa3c8658b7074967b7057a9823e7eacbdfc62c208a7c452c782127ade913aa46
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or SEO poisoning attack. The ClamAV detection and ML classifier strongly indicate maliciousness. The presence of external URIs and a high number of PDF links indicates an attempt to redirect the user to potentially malicious 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 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://kuzutuzo.ru/wix?keyword=oasis+guidance+manual+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495858/normal_6031833f96f2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_6024c3fe755ee.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/bosch_washing_machine_repairs_eastern_suburbs_melbourne.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/material_science_and_engineering_impact_factor_2018.pdfIn PDF document text
    • http://siwupezomejen.getenjoyment.net/51011973282.pdfIn PDF document text
    • http://3bki.ru/hybrid_athlete4becj.pdfIn PDF document text
    • http://cleanup-sale.site/tawupuninojavaleborogugikytk.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/10521161664g6763.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412173/normal_6023cb2aa7c9a.pdfIn PDF document text
    • http://ecoservice-vlad.ru/business_ethics_now_ghillyer3enjq.pdfIn PDF document text
    • http://lefibipefazefep.mypressonline.com/craftsman_625_series_190cc_lawn_mower_parts.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/rekawexuretowo/graphing_linear_equations_worksheet_7th_grade.pdfIn PDF document text
    • http://jalebuvubo.myartsonline.com/kopawoduto.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/64047131716.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/wiperekuzejofefuv.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/satolabibidev.pdfIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/xulaxu.pdfIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_5808ebe31c0b42e7881527a97c188416.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/trombosis_venosa_profunda_embarazo_gpc_rapida.pdfIn PDF document text
    • https://041f977c-1598-48cb-b578-3d63f550c8ab.filesusr.com/ugd/524ae3_1baaaed6de6d412dbfa87dd03cf8d123.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/tenevazodu.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_off0000d3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E1 5464 bytes
SHA-256: a7cb9c280eb64665ece534b318f3f89b11ef4ac443ead5f3e61ab0c0d1d33666
font_01_sfnt_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 10700 bytes
SHA-256: 484641f180b98bcc14419447386f7672f6ab6e1cb508c6bcf8707abe9c9c23db

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