Malicious PDF — malware analysis report

Static analysis result for SHA-256 559f629eed2d115e…

MALICIOUS

PDF

43.1 KB Created: 2020-03-29 11:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1b841a888e18f510fe241022d0256d58 SHA-1: 3e6c426f52607bf0f9b243678baa0aba124871e6 SHA-256: 559f629eed2d115e133a481edc1702684ab663cd404c316c0456fc51d77d4f4f
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 to other PDF files hosted on various domains, indicating a link farm or distribution network. The ML classifier strongly flagged this PDF as malicious. The document body contains garbled text but includes a reference to 'Autoridad para el transporte maritimo de puerto rico' and the wkhtmltopdf generator, suggesting a potential lure or disguise.

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://mindforyou.org/uploads/1/3/0/6/130620667/130620667.html#autoridad+para+el+transporte+maritimo+de+puerto+rico
    • http://modernessencestore.com/uploads/1/3/1/4/131406153/9920535.pdf
    • http://apricotbearcakes.com/uploads/1/3/0/7/130775742/rufidirumetepirem.pdf
    • http://strawhatgames.com/uploads/1/3/0/9/130969893/b7c8ff43a38.pdf
    • http://creativwork.net/uploads/1/3/0/5/130589032/4953523.pdf
    • http://danielareul.com/uploads/1/3/0/6/130621640/6f87a1fa0bb4848.pdf
    • http://3eatonpines.com/uploads/1/3/0/4/130436367/nabop.pdf
    • http://findapsychiatrist.com/uploads/1/3/0/9/130969362/lizemiketojise.pdf
    • http://omcups.net/uploads/1/3/0/6/130639574/165bb178a.pdf
    • http://yorkshirecoffeebeans.com/uploads/1/3/0/7/130739028/susefipezawafixi.pdf
    • http://nymoldassessor.com/uploads/1/3/1/3/131380471/tewatabonomebofi.pdf
    • http://mysticmancreations.com/uploads/1/3/0/5/130548039/baviwiruvifig_vepovubufi_sekiwitiru_xoxivubikeg.pdf
    • http://ausnwt.com/uploads/1/3/0/8/130873971/lofot_vamoxemavov_kalisepozo.pdf
    • http://knoxypsummit.com/uploads/1/3/1/3/131379944/7305619.pdf
    • http://zappersales.com/uploads/1/3/0/4/130489475/dagefedu_xibasikavosu_jademekaminoloj.pdf
    • http://themonthlyfriend.com/uploads/1/3/1/0/131070596/kusobo.pdf
    • http://trackpics.ca/uploads/1/3/0/2/130287898/df6679251d828cd.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_off00007cdb.bin
0ea3951606ebf6a02f00b38155d7d510be945dbc3a35101698466bc5aafeb9ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CDB 8880 bytes

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