Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef32c6a285b7987…

MALICIOUS

PDF

37.7 KB Created: 2020-04-01 20:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1ded3f0a5ad07e0506dd85c13714aae9 SHA-1: 0dbc854a4bf1b8edd18d08f780fb3475e7e35c50 SHA-256: 8ef32c6a285b79876d2924c34a294879951d7b1aa0c121b79a825212fcfb9cc4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness. No scripts were extracted, and the document body text is largely unreadable, making it difficult to determine a more specific attack pattern or family.

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://montanaterritorialalliance.org/uploads/1/3/1/1/131164293/131164293.html#christie+marie+sheldon+24+abundance
    • http://causewayleadership.com/uploads/1/3/0/8/130814914/puliviwuvevodez.pdf
    • http://workplacesafetyvictoria.com/uploads/1/3/0/4/130491075/2512135.pdf
    • http://mcceinleatherworks.com/uploads/1/3/0/5/130550703/dukawefaso.pdf
    • http://beeswim.com/uploads/1/3/1/4/131406453/18be04ffd.pdf
    • http://parkcitydoulas.ca/uploads/1/3/0/7/130775892/2613336.pdf
    • http://livingtouchfloral.com/uploads/1/3/0/7/130775002/duluderavalek.pdf
    • http://xrdsfaith.com/uploads/1/3/0/5/130589413/zevogiseluronet_fiwadewelomivi_medimivizijazo_delezixotum.pdf
    • http://optionsens.com/uploads/1/3/0/6/130621640/4d4a447a2.pdf
    • http://boostmybalance.com/uploads/1/3/1/3/131398219/fonotunakag.pdf
    • http://letlaura.net/uploads/1/3/0/5/130538842/21e4ddee.pdf
    • http://vintage-guitar.net/uploads/1/3/0/3/130324158/zisofivewigub-wawilabivobir.pdf
    • http://hawaiilimo808.com/uploads/1/3/0/7/130740012/genosugarenugige.pdf
    • http://arteconcept-design.com/uploads/1/3/0/7/130739222/gilekebobivelajaloze.pdf
    • http://oscarandrickmoving.com/uploads/1/3/0/3/130313013/1622129.pdf
    • http://apothecarythc.com/uploads/1/3/0/5/130588732/xidikatijori_dawotuxik_gevaxadosaga_seluxeruvox.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_off00006c31.bin
f033be1499f6dca20d6eb16bc5b11f2acc7656520a855ea7d4276b22c8ca9ed3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C31 7624 bytes

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