Malicious PDF — malware analysis report

Static analysis result for SHA-256 87506b3c04c5947f…

MALICIOUS

PDF

35.1 KB Created: 2020-04-04 08:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0d23f7d267f82e41c9275ff67f52ea97 SHA-1: d4f551c462638a093df7fa603458e35e28cada2c SHA-256: 87506b3c04c5947f99287d0d6076d2017a623a5fed408c013bab107a8b386513
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files on different domains. This suggests the document is intended to act as a link farm, potentially for SEO manipulation or to distribute further malicious content. The ML classifier also strongly indicated maliciousness.

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://customcolorposters.com/uploads/1/3/0/4/130490301/130490301.html#paul+simon+father+and+daughter+song
    • http://avonlakevisualart.org/uploads/1/3/0/6/130605393/5055219.pdf
    • http://mthomeimprovements.com/uploads/1/3/0/6/130639085/kilulos.pdf
    • http://mondesatravel.com/uploads/1/3/0/4/130476340/kuxigag.pdf
    • http://yessilashstudios.com/uploads/1/3/0/4/130483492/diturujulije_mumev.pdf
    • http://koreafarmchicago.com/uploads/1/3/1/4/131438038/badazaxuv.pdf
    • http://thebirddogapp.com/uploads/1/3/0/4/130435821/fobigufobo-bixijagutakubiv-dupuzi.pdf
    • http://thebeardedopen.com/uploads/1/3/0/2/130289554/tivosumapot.pdf
    • http://fashioneyewearnecessity.com/uploads/1/3/0/3/130324236/powojufav-puzixaxo.pdf
    • http://miningautomotive.com/uploads/1/3/0/5/130545633/doxojekozev.pdf
    • http://ichta.net/uploads/1/3/0/6/130604188/7191553.pdf
    • http://amicusacorn.com/uploads/1/3/0/2/130272985/tafoviraxufiga_rofuwikafeludas_jinowijodiw_xidimoxogal.pdf
    • http://sprucestreetlandscaping.com/uploads/1/3/0/3/130312926/kuvanijujefedo.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_off00006453.bin
05072d694c84a2b4c39ec54dd50bbf142d5f12cda0c910c2384101c029d3bd1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6453 6712 bytes

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