Malicious PDF — malware analysis report

Static analysis result for SHA-256 195f3f3558b764b2…

MALICIOUS

PDF

62.1 KB Created: 2020-04-11 08:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 955778d4883f39cddb5ed9f8e8b1ab4e SHA-1: 93b7b30aadeac5d9d075656c0f4a3123829f85ff SHA-256: 195f3f3558b764b2523a4ebce04fe82ac6af46c9b6fe585961b0e44aa3545954
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by an ML classifier as malicious. It contains a large number of external links, many of which point to other PDF files hosted on similar domains, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains a URL that is also present in the list of extracted URLs, indicating a potential lure to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://2dl6l.bpmtc.com/uploads/1/3/0/2/130274097/130274097.html#introduccion+al+derecho+resumen
    • http://locototejerky.com/uploads/1/3/0/7/130739313/08def6040.pdf
    • http://jrlfinancialplanning.com/uploads/1/3/1/4/131454766/bafezune.pdf
    • http://weddingassistantcolumbus.com/uploads/1/3/0/6/130604551/niwomen-mojefepar.pdf
    • http://estrategiaprofesional.net/uploads/1/3/0/2/130287314/rosuxupeze.pdf
    • http://annamariaphotographer.com/uploads/1/3/0/5/130551374/d7c6af3addfd4b.pdf
    • http://lavishlashlounge.org/uploads/1/3/0/4/130488241/bojagemitor-wodunebuparas-zomududol-rimeruje.pdf
    • http://www.register.washingtontwpparks.org/uploads/1/3/0/7/130738801/e1e585.pdf
    • http://fareharborsandbox.com/uploads/1/3/1/0/131070442/03156f1c8.pdf
    • http://interview-tools.net/uploads/1/3/0/8/130873830/gebesexedu.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8e1.bin
a1760086feaa2aa599d557d129238a9cfa8cacb504dfe5adee2801ee572bbfe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E1 9444 bytes

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