Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a624d64b5909977…

MALICIOUS

PDF

79.0 KB Created: 2021-03-16 21:25:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4b3b72a52d960ae10612f780a1cf49ec SHA-1: c3a8bd4af2167acd9c7834afa66bb614752cd299 SHA-256: 0a624d64b5909977b69e73de6476eafba3f20e1b1084af396dccf132a5fe8cdf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to domains associated with link farms and disposable hosting, indicative of phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are commonly used to redirect users to malicious 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 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://gimoguvi.ru/wix?keyword=race+car+vehicle+dynamics+pdf+free PDF link annotation
    • http://kakafeg.scienceontheweb.net/70500606110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480584/normal_5fd2f06632472.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368731/normal_604625ea3dc7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480736/normal_5fe08489da905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445104/normal_602152e785c51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446283/normal_602a36cc3b3fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_600b5b206c4fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504047/normal_604daa70ef0df.pdfIn PDF document text
    • http://xunopapazugatar.medianewsonline.com/88075700911.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5fe882541d1c6.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/34994592242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446260/normal_600a9d30c330b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376619/normal_5fdd9be79942f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pisonepegosa.myartsonline.com/bebegogu.pdfIn PDF document text
    • http://dowuvoduwitovos.atwebpages.com/20530589482.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/zejiberupumezuma.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/junji_ito_books_in_order.pdfIn PDF document text
    • http://laxufazekez.atwebpages.com/beckett_baseball_june_2020.pdfIn PDF document text
    • http://jukasuxoseki.atwebpages.com/net_present_value_irr_and_payback_period.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 5164 bytes
SHA-256: c89d98e6a4bc6127c7a97997e5713ef1641bb9fd2d20693c4167334dc576beb1
font_01_sfnt_off0000fc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3A 10636 bytes
SHA-256: 27d0170074254aa4aa28ddd684a1c2246d4e40f3147dbffe2f7841c426a9d3e4
font_02_sfnt_off000120a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A8 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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