Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbcec76c8395a506…

MALICIOUS

PDF

36.9 KB Created: 2020-05-30 23:40:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ec30eac5fab4c14558ebbf5f4bec6bb SHA-1: 6e65ed147f3f466fa435f1f9fd4c013a8abc52cc SHA-256: bbcec76c8395a5066c5838583711112317e800ca96d0ad139cdb8bf23cf56663
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF document was flagged as malicious by an ML classifier. It contains a large number of external links, many of which point to similarly structured URLs on different domains, suggesting a link farm or SEO spam operation. The primary URL identified is http://cpanel.jessicamiyuki.com/uploads/130740262/130740262.html, which is part of this network. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cpanel.jessicamiyuki.com/uploads/1/3/0/7/130740262/130740262.html#ohio+high+school+speech+league
    • http://mx.tiedyeharvest.com/uploads/1/3/1/4/131409463/5731159.pdf
    • http://iconizao.org/uploads/1/3/1/4/131406077/f9eee1d.pdf
    • http://bullcitycoach.com/uploads/1/3/0/3/130313000/7773923.pdf
    • http://preferredtowinghenrico.com/uploads/1/3/0/7/130776795/f50ccb7f15074.pdf
    • http://meter-key.com/uploads/1/3/0/5/130589047/9416776.pdf
    • http://full-sky.com/uploads/1/3/0/8/130814292/9698941.pdf
    • http://ugenetwork.com/uploads/1/3/0/7/130740244/gemoxudetazukit.pdf
    • http://rpjchildrensbooks.rpjandco.com/uploads/1/3/0/6/130639837/072566b1.pdf
    • http://ugenetwork.com/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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000654b.bin
bc9d11f48bd193c1f97dd916e73345a8f0fc02e38d5c95703353000349b0a77d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x654B 10332 bytes

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