Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86e0a87972a2d59…

MALICIOUS

PDF

36.7 KB Created: 2020-03-22 05:06:48 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fb83128e0a1568cc6058fe7ce8a6792d SHA-1: eb4745ab4cabcb42f2abb5ee5677970c006fa91e SHA-256: f86e0a87972a2d599cca38756b6a978d5f3b32820f20a9e257eaf24f8ba409ab
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which follow a similar numeric slug pattern, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, mentions 'Tipos de un focus group' and includes the wkhtmltopdf generator, suggesting a deceptive lure to external content.

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://zenmapodcast.com/uploads/1/3/0/8/130873735/130873735.html#tipos+de+un+focus+group
    • http://roosthousingcoop.org/uploads/1/3/0/9/130969462/01898.pdf
    • http://chichestersailing.com/uploads/1/3/0/2/130289676/5781865.pdf
    • http://flourishskinandbody.co.uk/uploads/1/3/0/8/130813429/kesizasew.pdf
    • http://avecbrioconseils.com/uploads/1/3/0/2/130272483/2728294.pdf
    • http://www.marellimedic.com/uploads/1/3/0/6/130622103/romorajozerosoponir.pdf
    • http://www.miputt.com/uploads/1/3/0/5/130590334/tavokuwado-pebevawodar-sosujupomifupoj-komelox.pdf
    • http://nuneve999.com/uploads/1/3/0/6/130604986/tukukituvurimezeteto.pdf
    • http://www.wendymmillerpsyd.com/uploads/1/3/0/8/130813526/8476d50e02.pdf
    • http://merakihandmades.com/uploads/1/3/0/4/130476740/fopumev.pdf
    • http://veteransmusicfest.com/uploads/1/3/0/7/130775309/notutofumuwub.pdf
    • http://destinychristianacademy.org/uploads/1/3/1/1/131163578/palabex.pdf
    • http://advbioco.com/uploads/1/3/0/7/130776070/8248776.pdf
    • http://engagemediacorporation.com/uploads/1/3/0/2/130288453/bukex.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_off000067dd.bin
faf2d711cc2bd11b3070c4ce3abd94d93c0ae405a81c16d1ef46e4b0e9335c2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67DD 7788 bytes

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