Malicious PDF — malware analysis report

Static analysis result for SHA-256 7253f6fc41176be1…

MALICIOUS

PDF

33.8 KB Created: 2020-04-03 16:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3e1cb91776680965bb389ccc55e742a0 SHA-1: 135ae8eda5491763c36cf86de05ea567b82ffa5d SHA-256: 7253f6fc41176be1d8cfcbaad6e5800483d3c4216818ce72ac59e9ee0758d8a5
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links to external PDF files, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. While no scripts were directly extracted, the structure and embedded URLs suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jovenesdiplomaticosac.org/uploads/1/3/0/2/130274371/130274371.html#mecanica+dos+fluidos+fox+download
    • http://forestvillle.com/uploads/1/3/0/8/130814020/movefajibugulur.pdf
    • http://eatthinkandbemerry.net/uploads/1/3/0/5/130542870/dokerojefitubuvo.pdf
    • http://coloradostaging.design/uploads/1/3/0/6/130622058/vozogelazatude.pdf
    • http://com4u.eu/uploads/1/3/0/3/130379274/nifekafuwijavubase.pdf
    • http://mustardseedkc.com/uploads/1/3/0/6/130604144/fcb579755f0f3d.pdf
    • http://rubiconrescue.com/uploads/1/3/1/4/131483391/33a24.pdf
    • http://handmadeinct.com/uploads/1/3/0/4/130435835/rawivobob_giranolub_duxutejiber_rebifesanof.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_off000056b6.bin
b948b68c100ce0e9a59f0f7392d2cd42c52f8b27fd17b047fd44a5edd12a0e46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56B6 10108 bytes

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