Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ba1046057069ed…

MALICIOUS

PDF

75.5 KB Created: 2021-02-18 21:58:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 970902d1c53abb6a9598e58ab7a6e208 SHA-1: 6a7c2ee415d68f80545c5f42978394f7d3ea03fb SHA-256: 53ba1046057069edf5b3b82f50b651007495e0cb1fb2fe6582acbbc0656abcb8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving redirection to malicious sites.

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://baarspo.ru/123?utm_term=medical+spanish+translator+online PDF link annotation
    • https://roxuvipiga.weebly.com/uploads/1/3/4/6/134637137/redibaba.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/gcaiabN/39266942120.pdfIn PDF document text
    • https://nozifudofo.weebly.com/uploads/1/3/2/6/132681081/tison-fenov-vitinevidulisa-xumedupurukaboz.pdfIn PDF document text
    • https://pufetebad.weebly.com/uploads/1/3/4/7/134711346/jaluz.pdfIn PDF document text
    • https://baboxubawuxi.weebly.com/uploads/1/3/4/6/134666135/tuzidesumikifaxodej.pdfIn PDF document text
    • https://lenololiwi.weebly.com/uploads/1/3/4/4/134455370/xelula.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/jenuja-vurajimizibemu-murafoxubaluza.pdfIn PDF document text
    • https://fukorolavo.weebly.com/uploads/1/3/4/6/134639224/kunuxegef-budunun-papijozubaxusix-tujiwed.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/jaUiiYz/battle_bay_for_pc.pdfIn PDF document text
    • https://kunolutupevuj.weebly.com/uploads/1/3/4/7/134772201/2150175.pdfIn PDF document text
    • https://cdn.sqhk.co/ratevusur/ptxiiA3/zanugunanozotelatevew.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/kibavutibeved/59931707857.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/99787156283.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/46454548771.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/problem_solving_maths_grade_5_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/22249152789.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_off0000e9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C0 5168 bytes
SHA-256: 6af9018563f0132cbb0cf2b3f1f8bc3cda915b8a5879d14a4f79b04869a955d5
font_01_sfnt_off0000fb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4E 11200 bytes
SHA-256: 0daec0c7b8dfa8c1d14426e6aa21d7852074a4cd86206fc2e81127c5f3c1c8cb

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