Malicious PDF — malware analysis report

Static analysis result for SHA-256 2acb4c598cd7e51a…

MALICIOUS

PDF

85.7 KB Created: 2021-02-22 10:36:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d99d0e0ecae80dc8b557f0f208c080ca SHA-1: 9eff489b91d93aa5d3d754f32fa0dedd497a3a5f SHA-256: 2acb4c598cd7e51acc8b342d7713aa0bab001d9871d3c6478c3d9cb8bf1366b8
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains multiple embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure at 'https://yafferge.ru/strik?utm_term=too+big+to+fail+movie+reviews'. The document body is heavily obfuscated, but the presence of numerous links suggests a link farm or phishing attempt designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=too+big+to+fail+movie+reviews In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393499/normal_6019c8a02e0b0.pdfIn PDF document text
    • https://bixuduserar.weebly.com/uploads/1/3/4/8/134861961/redipapugeb.pdfIn PDF document text
    • http://exampl1214.com/scope_of_work_sample_templateja5t0.pdfIn PDF document text
    • https://vinenuji.weebly.com/uploads/1/3/1/4/131453259/wukovupi-rudixa.pdfIn PDF document text
    • https://fikuzafunowu.weebly.com/uploads/1/3/1/8/131857523/muradexanata-batimusuginit.pdfIn PDF document text
    • http://easylearning.space/datanufanevadijotwusvw.pdfIn PDF document text
    • https://nowabarabowuxo.weebly.com/uploads/1/3/4/3/134319250/2187192.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402933/normal_5ff25b36e699f.pdfIn PDF document text
    • https://cdn.sqhk.co/xewumoxu/gcHt9SC/66706189114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380695/normal_6010f1560c2fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421050/normal_5fc9ada5af802.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/khh1Dhg/meweb.pdfIn PDF document text
    • http://susurrus.space/jowadedukopovaw2kqa.pdfIn PDF document text
    • https://cdn.sqhk.co/tasaxasup/fgchigF/damagu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 11416 bytes
SHA-256: c68ec3ef128b1b5d31adbcbf7d3208c1c0f486b2f2078fe7904d6d2934e9905c
font_01_sfnt_off000112e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E6 5328 bytes
SHA-256: e2ce6dd5688bd5069b0686765e89d2739febb9d034442404409b21bc03bd2f84
font_02_sfnt_off00012510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12510 10676 bytes
SHA-256: d048cd3cf7d14ed4954be661839d1fb77db3db6e9c8ac9780a612112514d11ea

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