Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea434a984213c23…

MALICIOUS

PDF

95.5 KB Created: 2021-02-24 11:52:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0df7ff9f09ed2e120ff8520d1113379f SHA-1: 002c4b7ff77c9c9332b7ae0c506c687d16639947 SHA-256: aea434a984213c238b06add6aea0b5744e89cecaa05bd8b85157b7b17dcf60ca
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting redirector patterns, suggesting a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques 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://druttle.ru/strik?utm_term=what+sports+games+will+be+on+ps5 PDF link annotation
    • https://bikugepoxo.weebly.com/uploads/1/3/5/3/135351236/32d0733a.pdfIn PDF document text
    • https://vosovijuz.weebly.com/uploads/1/3/0/8/130813614/nafaguxawunuduvosedi.pdfIn PDF document text
    • https://menanotiji.weebly.com/uploads/1/3/4/3/134322389/kulibivugijusuteluz.pdfIn PDF document text
    • https://lepatoketi.weebly.com/uploads/1/3/4/7/134732542/keture.pdfIn PDF document text
    • https://xupodidif.weebly.com/uploads/1/3/0/7/130739682/febop_fikolovewimimik_ludakerofuve.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/gjjAQpx/vomebowajidamub.pdfIn PDF document text
    • https://fabezetenonuke.weebly.com/uploads/1/3/4/8/134846610/pavegupugap-vavanagikuwoz-nivokakizimi-jadufaz.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/jahdSGH/lasapalikagexapogola.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/ghqFjfG/59046931878.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/WOSgFW5/11426080631.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/cjhh4BU/servsafe_test_scores.pdfIn PDF document text
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/298312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384316/normal_60266442b160a.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
    • https://s3.amazonaws.com/memobofilenabon/elements_of_literature_review_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/jozaguzisupopoke.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/english_speaking_classes_for_adults.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_off0001296b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296B 5388 bytes
SHA-256: 93bef502656aaf26111dacda70e1f83c66b001b4ed320cf438c949ab3a14d56a
font_01_sfnt_off00013bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAC 11416 bytes
SHA-256: de39aca4262cd8a9fe701f870c5b57beba5d28ff3115de29e4309dd14e2217a1
font_02_sfnt_off0001627b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1627B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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