Malicious PDF — malware analysis report

Static analysis result for SHA-256 07d569cf37045476…

MALICIOUS

PDF

41.6 KB Created: 2020-03-29 02:45:26 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e1afa17714ea6bdc3e928750e1cb5f7f SHA-1: a6ecdaae31b2f8ca13fde72cb5a902900599d8ff SHA-256: 07d569cf37045476cfb1a5497d2236b3a89dca3a3e3fb1b8d18ffc54496241dd
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which point to other PDFs, suggesting a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The presence of a "download" call-to-action phrase further supports a malicious intent to trick the user into downloading further malicious content. The document body itself is heavily obfuscated but contains embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://100percentmaintenance.com/uploads/1/3/0/7/130739878/130739878.html#signal+processing+first+mcclellan+pdf+download
    • http://juliaadrift.com/uploads/1/3/0/5/130590158/koxuk.pdf
    • http://teaseanddeny.info/uploads/1/3/0/2/130271038/tozoxuputoz-supitobojewadas-zazonum.pdf
    • http://indianaancafe.com/uploads/1/3/0/2/130289283/ruzelomokok.pdf
    • http://rebelacademytheatre.org/uploads/1/3/0/5/130543377/1843838.pdf
    • http://mocorpaggregates.com/uploads/1/3/0/6/130620521/832f18ddece.pdf
    • http://northcoastoutfittershunting.com/uploads/1/3/0/2/130291544/051041b4d80355.pdf
    • http://caminatasaludable.com/uploads/1/3/0/5/130588807/2154742.pdf
    • http://www.qbaby1314.shop/uploads/1/3/0/5/130544672/9009327.pdf
    • http://www.myrolemodel.info/uploads/1/3/0/4/130491001/worada.pdf
    • http://aspenvalley.org/uploads/1/3/0/5/130551387/wapejovinajidobe.pdf
    • http://vancouvervacationrentals.org/uploads/1/3/0/7/130776158/3594991.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_off00007a4d.bin
84a6e853d0717232157a6d9d5735de58a58a1a8b3fc3f1ddfbd298ac9350b33c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A4D 8100 bytes

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