Malicious PDF — malware analysis report

Static analysis result for SHA-256 532a6333f74bc2b4…

MALICIOUS

PDF

78.8 KB Created: 2021-04-01 15:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2b18d592b2ad031003c4d93fce43d194 SHA-1: c27a94518c2303bda5a68658890de5ae3a550f4a SHA-256: 532a6333f74bc2b4f5913b7fa98bf513a7c573c808fdfd7c9fa0f97888cceaf0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is described as a link farm on disposable hosting, indicating an attempt to redirect users to potentially harmful websites. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document's primary function is to facilitate initial access via spearphishing, leading users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://botokaw.ru/award?keyword=biblia+reina+valera+pdf+1960 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379959/normal_603a0d241ace0.pdfIn PDF document text
    • http://esplus.pro/329638939405fldk.pdfIn PDF document text
    • https://cdn.sqhk.co/firijanab/LiiYqjc/sitamuma.pdfIn PDF document text
    • http://modarab.mygamesonline.org/away_in_a_manger_chords_in_d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459320/normal_5ff2e1b645981.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/XypoGkB/minecraft_earth_skin_editor.pdfIn PDF document text
    • http://cmbespaceclient.xyz/welebarabesovejabudeuhmdl.pdfIn PDF document text
    • http://kawlites.online/buzafagokopijipefuvil3dl5.pdfIn PDF document text
    • http://mawosatejojeka.sportsontheweb.net/cervical_cancer_screening_methods.pdfIn PDF document text
    • http://hookup750.website/luwukajajatutuk50667.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365601/normal_5fce9757ab66a.pdfIn PDF document text
    • http://tiwujatujoput.mygamesonline.org/safutig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454668/normal_5fc81443ad0ed.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/75872906663dqllr.pdfIn PDF document text
    • https://cdn.sqhk.co/vudebalox/ia2iahe/63082569153.pdfIn PDF document text
    • https://cdn.sqhk.co/vofonowul/gcOJjbl/vokelejigujavetewurebu.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/tuvinomarix.pdfIn PDF document text
    • https://cdn.sqhk.co/kubibosujiko/jbAZibC/41115647567.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/viboxikuz/edsby_hcps_report_cards.pdfIn PDF document text
    • http://xenuduximowub.epizy.com/zeliluvepufemepifinuwasek.pdfIn PDF document text
    • http://borinalujid.epizy.com/38914718193.pdfIn PDF document text
    • http://nodikaduf.onlinewebshop.net/css_books.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/w-_4_allowances_form_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/96967347279.pdfIn PDF document text
    • http://pukowevuvifa.rf.gd/avengers_2016_ringtone.pdfIn PDF document text
    • http://gejofizax.rf.gd/nedavebegive.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_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 5612 bytes
SHA-256: 5f5af63c026cfc72fd59b5a8a897d1c9d90273719c441dcea546eb0090e6b146
font_01_sfnt_off0001084c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084C 11332 bytes
SHA-256: 7d603811ef9cd80d561a2eb440d47d3eb4aeb46c37fe01d42df43b7928e74f0d

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