Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b78eb38bc4a7e33…

MALICIOUS

PDF

76.3 KB Created: 2021-02-27 11:21:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 39f9ec7e4f78db524387a72e5e11bb3d SHA-1: e925baad84e5217bac3de060cb827b4b8ef4f27d SHA-256: 5b78eb38bc4a7e33aaa584cf4964c226bf0fa83f98455076c12fb1d17d39ef3c
124 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, many pointing to disposable domains, suggesting a link farm or phishing lure. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_URI heuristic highlighting a specific external URL that appears to be part of a phishing campaign. The document body, though heavily obfuscated, contains metadata related to its creation, but no clear textual lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9760

Heuristics 4

  • 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
  • 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://xezojetit.ru/award?keyword=ryobi+cs26+air+filter+cover PDF link annotation
    • https://cdn.sqhk.co/woxemumi/BhaDhdu/collaborative_post_it_notes_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454821/normal_6039cafec6e50.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzikewed/bgeQTie/fenulabosegumixusamubo.pdfIn PDF document text
    • http://hyipinvest.site/59393242143n61vk.pdfIn PDF document text
    • https://xutobegepoxebax.weebly.com/uploads/1/3/5/3/135333125/175319.pdfIn PDF document text
    • https://jaxikagiwuzeno.weebly.com/uploads/1/3/4/6/134698588/0840e65e8a666.pdfIn PDF document text
    • https://wafulezejo.weebly.com/uploads/1/3/4/7/134748518/2667690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_6031bf665d8e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485702/normal_60350cb9b5430.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/xeterovasuxaronax.pdfIn PDF document text
    • http://vifezitenof.getenjoyment.net/stages_of_the_grief_cycle.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/napuno.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/iidjiig/tupese.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/wofakakisuvaravorobivazo.pdfIn PDF document text
    • http://wawebepibalura.epizy.com/lujekujivudakezu.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F82 5468 bytes
SHA-256: 979e4cc1707ea51580010da40a782a3116a30090063fde6d916eb9daa1fb3806

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