Malicious PDF — malware analysis report

Static analysis result for SHA-256 98dba1bd2099e39c…

MALICIOUS

PDF

76.7 KB Created: 2021-03-04 12:36:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e3fd6a66f2ed9b89e891947b7699e4be SHA-1: 199441d89d20877ddbe45f3d220a71139cfb88be SHA-256: 98dba1bd2099e39cde69354a98f216fe0f14479ca684d8b4f77890a233982821
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or scam attempt designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/award?keyword=como+hacer+la+malta+de+cebada PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416661/normal_5ff166be8a6ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443325/normal_600101ab17fcd.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/80604457838.pdfIn PDF document text
    • http://votixibutiro.medianewsonline.com/fexavaj.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/why_is_my_lawnmower_backfiring.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477137/normal_600442cbb0219.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371013/normal_5fe15a0da86bb.pdfIn PDF document text
    • http://ninomut.sportsontheweb.net/what_was_invented_during_the_agricultural_revolution.pdfIn PDF document text
    • https://fumewalifo.weebly.com/uploads/1/3/4/8/134884483/rufolixojulawilerir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452587/normal_6020f955c373d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_602678ea3d45f.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/88181833679.pdfIn PDF document text
    • https://sepetumeba.weebly.com/uploads/1/3/4/6/134601334/xozepixipegifazaka.pdfIn PDF document text
    • https://famutogerene.weebly.com/uploads/1/3/4/6/134688643/vizepepixeba-xenefiwidepeb.pdfIn PDF document text
    • http://kovatafob.mypressonline.com/miragesewaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379726/normal_5ff691b700955.pdfIn PDF document text
    • https://tololomajaju.weebly.com/uploads/1/3/4/4/134472688/wigujujutesidewuxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xovijoj.epizy.com/sisajudepakodapixoxizeve.pdfIn PDF document text
    • http://sasomibaben.rf.gd/how_to_reset_orbit_hose_timer.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_off0000edf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 5044 bytes
SHA-256: b8f491ae3bb54d7ad17f6514ea822d78492b6138fb50db60cbc234f3b3d8ce08
font_01_sfnt_off0000fede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDE 11240 bytes
SHA-256: 2c40676bb3df06bb208885d0269a8909b3bf9cf4107f660eda0a7ff96c5aacbe

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