Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d24ea3576b7310f…

MALICIOUS

PDF

63.2 KB Created: 2021-02-24 02:26:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8e94d51e1dc160a9d281eca81f126811 SHA-1: 9318343e2ca944902094cc94b4b128d718078bd9 SHA-256: 7d24ea3576b7310f03510899a09d59d21129af65eddf459c0f0c4e6ee1da83c5
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, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to search queries, directing users to external sites. No scripts were extracted, but the overall structure and URL distribution suggest a phishing or redirection campaign.

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://jottigo.ru/123?utm_term=how+do+i+start+writing+a+movie PDF link annotation
    • http://lagimuzovixur.iblogger.org/adverbios_en_ingles_lista.pdfIn PDF document text
    • http://fesebenawasoz.iblogger.org/najiguzoludasu.pdfIn PDF document text
    • https://ruwagifixub.weebly.com/uploads/1/3/4/0/134013037/416befd28e1e2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391634/normal_5ffab5d63819d.pdfIn PDF document text
    • http://rutidewebatodug.iblogger.org/senezatatimibuxijesisof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482191/normal_6013f052c4d3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384484/normal_6017402076c59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382962/normal_6024c36d2413c.pdfIn PDF document text
    • https://pukexomupuko.weebly.com/uploads/1/3/1/1/131164185/dagodewawevipet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jatufivo.rf.gd/bylaws_non_profit_template.pdfIn PDF document text
    • http://bigofufujenu.epizy.com/lower_gi_bleeding_guidelines_uk.pdfIn PDF document text
    • http://wedutatitupaze.epizy.com/django_bootstrap_form_readonly.pdfIn PDF document text
    • http://madanekobovuge.epizy.com/zufetibogatupedafoba.pdfIn PDF document text
    • http://zebafuvevejol.epizy.com/dufuzanodewalibageti.pdfIn PDF document text
    • http://jukigegamoma.epizy.com/jofaseraporuj.pdfIn PDF document text
    • http://livofos.epizy.com/75471719223.pdfIn PDF document text
    • http://gixogofano.rf.gd/muwaji.pdfIn PDF document text
    • http://sipomivizipe.epizy.com/zudajedagoxituseni.pdfIn PDF document text
    • http://kobizesamow.rf.gd/answering_specialists_inc_phone_number.pdfIn PDF document text
    • http://gunexukod.epizy.com/la_biblia_dios_habla_hoy_descargar_gratis.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_off0000bf60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF60 5228 bytes
SHA-256: 33ea8ae4c317b56c0e0f0c7eca5479ba8068309c75441c723ba79d43930c1e2b
font_01_sfnt_off0000d126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD126 8996 bytes
SHA-256: b78a0c20886ea0e6c39e6810e2bd3105c85beb04f04c6bc477164792916caf20

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