Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6dfba32ebad1ee…

MALICIOUS

PDF

87.2 KB Created: 2021-05-16 10:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7610c2e8421fa2903899c5928776b6ac SHA-1: 4257dc5fbbb39ac34eb0b9f9ca2b34cf8d9066c0 SHA-256: cb6dfba32ebad1ee8fc8a6594baa45d780b0841dbe9a9bdc920073b2d23d8763
244 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are hosted on disposable domains or known malicious redirectors, indicating a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for distributing further malware or conducting phishing attacks. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/strik?utm_term=lemon+detox+diet+plan+for+weight+loss In PDF document text
    • https://siwizapetodid.weebly.com/uploads/1/3/4/0/134041585/9850061.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467005/normal_6031316fad5b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406776/normal_5ffa94e46cd60.pdfIn PDF document text
    • https://cdn.sqhk.co/zopimoforaja/ifjhjdX/gujarati_alphabet_with_pictures.pdfIn PDF document text
    • https://zamigemunizi.weebly.com/uploads/1/3/4/3/134347724/696430.pdfIn PDF document text
    • http://rezemuzarafala.22web.org/las_batallas_en_el_desierto_analysis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425238/normal_5fc7c959e5b2e.pdfIn PDF document text
    • http://foxuzopigudomin.22web.org/keeping_employees_accountable_for_results.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/ifhh8tR/votewunigujodutujekuxeg.pdfIn PDF document text
    • http://lezozopose.iblogger.org/jivuga.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/ggS6NXg/12941773503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386606/normal_601b93a2b32eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477655/normal_6044d851efcc5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_a73d3cddf6214a2f91dfe4863fffff6d.pdf?index=trueIn PDF document text
    • http://getorisatenazu.rf.gd/chloroformic_acid_benzyl_ester.pdfIn PDF document text
    • http://lidagigum.rf.gd/14191797902.pdfIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_776e33fd98634f5a8804cff4cd4a7d22.pdf?index=trueIn PDF document text
    • http://zoxutuperovizo.epizy.com/venaseposikab.pdfIn PDF document text
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_313ec1ec80644d73b63cbaaa90eca8bc.pdf?index=trueIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_b52ebd57b26c4ad8bda2fd2e62f7f4ad.pdf?index=trueIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_7ffc5ceb144349629e11081d31281df1.pdf?index=trueIn PDF document text
    • http://derajovaku.rf.gd/vokokidepefuralitopugi.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_off000114b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B2 5556 bytes
SHA-256: 1b02be5c5dd808f64a530bd648f1f845855f30691ade78b47cb5b5e551890c66
font_01_sfnt_off0001278f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278F 11728 bytes
SHA-256: bec5eaa9af6a9c42e64436d82289a21d75f20688eb7ab035b0744ab7a97dba01