Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea33933a0f94b6bd…

MALICIOUS

PDF

70.7 KB Created: 2021-05-29 10:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 837d8d57267e4966dadc080e8ca3bce9 SHA-1: 9b0529c769fb4cbe84b87ded01644141d6546ead SHA-256: ea33933a0f94b6bdfee44157812ae445dcf7965018ffb869db5e620cf37bd245
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, identified as a link farm, with the primary lure being 'First aid usmle step 1 audiobook'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive external linking suggest it is designed to redirect users to potentially harmful content.

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 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.
  • 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://resalured.ru/strik?utm_term=first+aid+usmle+step+1+audiobook PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370737/normal_5fcbd59829d98.pdfIn PDF document text
    • https://vumizopefi.weebly.com/uploads/1/3/5/3/135313358/4398005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_604a64243bc7c.pdfIn PDF document text
    • https://gakezepatirana.weebly.com/uploads/1/3/2/7/132712251/4d8a51ec119f77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467573/normal_601e6471429a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414336/normal_600f7d77679e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483361/normal_5ffcfb11a47d6.pdfIn PDF document text
    • https://waponalafax.weebly.com/uploads/1/3/4/5/134529016/wesumowojujatiwozep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486346/normal_602b9040d1336.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490918/normal_60217a9f89f01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481662/normal_6067c58ea28ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408002/normal_5fe90e60f2d08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471249/normal_6018d46d46063.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447465/normal_603aceded1e2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384851/normal_5fdc139b4691c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474169/normal_60242dc982c95.pdfIn PDF document text
    • https://ronesafoko.weebly.com/uploads/1/3/4/3/134312324/b78be7684.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c87ec7f6-5975-4da5-be04-133548e5f538/zupez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d263a5c3-115c-4be3-94ec-148a846d642b/11618477170.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_off0000d3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CB 5316 bytes
SHA-256: 3af4114b514068d4488792f1f88c9c7b34f68c3aaa8256849b758091a013dd81
font_01_sfnt_off0000e5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CA 11224 bytes
SHA-256: 8f2c9e0e2daf1114413708eb6bde83b266d00c0d49638d15cd106a94006d1cd1

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