Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8162222d8f5bab…

MALICIOUS

PDF

71.3 KB Created: 2021-04-01 04:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e00a7ebc9bb4bb2ffeb3d9ff62d497fb SHA-1: e0c6aa6d172d8ee299433dd4dfb74de0337afa10 SHA-256: dc8162222d8f5bab0733e1c2392a88c15094637782eaff490b0a6077527d3b72
194 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 hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and numerous external links are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/strik?utm_term=past+simple+past+continuous+perfect+english+grammar+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467576/normal_604d28537a453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445558/normal_6016bab785b62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460460/normal_60630a8367ba2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489241/normal_600b680d2cabf.pdfIn PDF document text
    • http://bossyonlinex.com/sadox1riyt.pdfIn PDF document text
    • http://tuwukadinem.mygamesonline.org/26913951032.pdfIn PDF document text
    • http://obzorov.site/shrinking_ice_sheets_and_glaciersa2ysv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417418/normal_605f2779558a1.pdfIn PDF document text
    • http://jeseselanus.scienceontheweb.net/counterproductive_work_behaviour.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/telewo.pdfIn PDF document text
    • http://warokibujiz.getenjoyment.net/55201028278.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/julaxel/68260290918.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/reformas_borbonicas_militar_resumen.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/64733475838.pdfIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_7426facba61c4a6a9cfae14dcc784bf0.pdf?index=trueIn PDF document text
    • http://wozimape.onlinewebshop.net/kufumamikabaw.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/72517326639.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/longitude_and_latitude_worksheets_with_answers.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_9f3c163cdc924b849626d4c642609876.pdf?index=trueIn PDF document text
    • http://jutagejefutix.atwebpages.com/american_english_file_2_free.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_off0000d8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E2 5568 bytes
SHA-256: b56da1f95a419b65287844ba8891efa4d3ef97354197cf58f63237d780e64ade
font_01_sfnt_off0000eba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 10544 bytes
SHA-256: a42bb633f0da7293205eda421b477973b6d29bf11a5e954f8cab2a82c815120f