Malicious PDF — malware analysis report

Static analysis result for SHA-256 528cbb2a4a1da90d…

MALICIOUS

PDF

41.3 KB Created: 2020-04-12 05:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fd1ba20e305a14a7499cfecfa6ab7441 SHA-1: 1da33a6c0c35473ac6932ddeb37b65a3aedafacb SHA-256: 528cbb2a4a1da90d1c71b4bef63db2d9c80cb3b6fa1618fb232c3899c41480c1
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, characteristic of a link farm, likely intended to manipulate search engine results or serve as a distribution point for malicious content. The ML classifier strongly indicated maliciousness. The embedded URL points to a page with a title suggesting a movie download, a common lure. No scripts were extracted, limiting the analysis of direct execution behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://redoxamazingmolecules.com/uploads/1/3/1/3/131380404/131380404.html#descargar+crepusculo+amanecer+parte+1+espa%C3%B1ol+latino
    • http://carriehohmann.com/uploads/1/3/0/3/130379743/7519201.pdf
    • http://mmarconsultoriodeenfermeria.com/uploads/1/3/0/8/130813132/0cacd4.pdf
    • http://clearpathbrokerage.com/uploads/1/3/1/4/131438899/7789290.pdf
    • http://olgunuz.com/uploads/1/3/0/9/130969706/3485504.pdf
    • http://altenterprisesllc.com/uploads/1/3/1/4/131406413/547fe7e876.pdf
    • http://vitaperformance.net/uploads/1/3/1/3/131383647/d8f8d.pdf
    • http://drummersanonymous.net/uploads/1/3/0/7/130739607/pusomox-relekarolexew.pdf
    • http://indi-vibes.com/uploads/1/3/0/3/130323900/6516221.pdf
    • http://paanlovers.com/uploads/1/3/0/3/130323527/6fc531f89.pdf
    • http://onsiteautomotiveservices.com/uploads/1/3/1/4/131405962/2ee312.pdf
    • http://fearhouse.net/uploads/1/3/1/6/131637668/75743c.pdf
    • http://bscsuccess.com/uploads/1/3/0/4/130436154/6486158.pdf
    • http://fearhouse.net/uploads/
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069eb.bin
721084d447feb6ced31e1699855f8f3d1da08dd02d483dc25c56f26352aecd4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69EB 9572 bytes
font_01_sfnt_off00008cb6.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB6 2616 bytes

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