Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa5b0dc3f92ec8a…

MALICIOUS

PDF

38.8 KB Created: 2020-06-06 07:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7b4282f7a4a59b9e885b00c6852dc9d SHA-1: e495ebec60b616dfee1b0d6427ad1066e6442ad5 SHA-256: 7aa5b0dc3f92ec8abf217480423964ccb14d1953dc157bf7184604630169780b
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains numerous external links, indicative of a link farm or phishing lure. The document body, though heavily obfuscated, contains URLs that are also listed in the heuristics, suggesting the primary purpose is to redirect users to potentially malicious content. No scripts were extracted, but the PDF structure and heuristics strongly suggest a malicious intent to lead users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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 http://promptservicesllc.com/uploads/1/3/0/7/130739906/130739906.html#provinha+brasil+2017+para+imprimir+2o+ano
    • http://qualitycuts209.com/uploads/1/3/0/2/130270889/madej.pdf
    • http://4pw.undesirable.us/uploads/1/3/0/7/130775342/vugejolizubo.pdf
    • http://status2.infotechstudios.com.au/uploads/1/3/0/2/130288448/sogojilemaz.pdf
    • http://promptservicesllc.com/uploads/1/3/0/7/130739906/terms.html
    • http://promptservicesllc.com/uploads/1/3/0/7/130739906/dmca.html
    • http://promptservicesllc.com/uploads/1/3/0/7/130739906/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://varesewivoja.files.wordpress.com/2020/06/3954794522.pdf
    • https://wimaped597797669.files.wordpress.com/2020/06/9497884592.pdf
    • https://negajifo.files.wordpress.com/2020/06/kelasofuba.pdf
    • https://pagapulikuv.files.wordpress.com/2020/06/2360509088.pdf
    • https://papogepovoko927125196.files.wordpress.com/2020/06/lavonufosovi.pdf
    • https://dozobozugut.files.wordpress.com/2020/06/35289288451.pdf
    • https://nagimogiz.files.wordpress.com/2020/06/zorogizo.pdf
    • https://fudejas.files.wordpress.com/2020/06/32631885044.pdf
    • https://buviwejurofo.files.wordpress.com/2020/06/58319135659.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000676e.bin
ed4d24b118d723d97f279dae92727ee85b4066f179804f7eea64a6fdb3348af4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x676E 12656 bytes

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