Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3cf2bd212a79193…

MALICIOUS

PDF

113.2 KB Created: 2021-03-02 15:43:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: b4e7fa7e659a85c76d3b8a8ea176da27 SHA-1: 1e54ac5c2a618509ca0589c897b17a0e246d11d7 SHA-256: c3cf2bd212a79193ea8c2dfeb1ea705668b80e3ad740baae860c96c7ed1c86e3
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the presence of numerous external URIs suggests the document's primary function is to redirect users to potentially harmful websites.

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://zajinet.ru/123?utm_term=que+diferencias+existen+entre+destilacion+simple+y+destilacion+fraccionada PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419192/normal_5fd7cb0145e2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387411/normal_5fc75a9736146.pdfIn PDF document text
    • https://xegugunozom.weebly.com/uploads/1/3/1/4/131482992/bafetobipi_kemevegivaxi.pdfIn PDF document text
    • https://munuliwakubife.weebly.com/uploads/1/3/1/6/131637312/540791bb87a.pdfIn PDF document text
    • https://kavirozix.weebly.com/uploads/1/3/3/9/133999962/tuzaxuvozozik_sunej_lozekeveteg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464852/normal_5fd33fc5a9fe2.pdfIn PDF document text
    • http://eslivdrug.space/stellaris_can_you_abandon_planets9z2y6.pdfIn PDF document text
    • https://kusafowagu.weebly.com/uploads/1/3/1/8/131871480/jutuxemolabe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401703/normal_5ff2496a39c9d.pdfIn PDF document text
    • http://kijuguwosaxo.22web.org/bill_of_sale_florida_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491725/normal_5fe3d7617082a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367013/normal_60027849ecfb0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jizuwugi.rf.gd/tizifepigamolaxera.pdfIn PDF document text
    • http://pupitudaxomibi.epizy.com/pakos.pdfIn PDF document text
    • http://refitebi.epizy.com/fawonupazofufozitifiwif.pdfIn PDF document text
    • http://suvejozuwedur.epizy.com/simanopenim.pdfIn PDF document text
    • http://vidomolojo.epizy.com/logupisozirow.pdfIn PDF document text
    • http://betiger.epizy.com/bekaboo_full_song.pdfIn PDF document text
    • http://dudakesiburegig.rf.gd/3829370669.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_off0001741c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1741C 5532 bytes
SHA-256: 2fd30455bf99a5f74fd294808a18b09b632c98558ae8fe1b91a4f74d285bf548
font_01_sfnt_off000186e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186E4 14668 bytes
SHA-256: cd414c70ba0e50a5e82d0fd653b5313723451cd82e972657fdad663f2a2cf894

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