Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c982c17160e7188…

MALICIOUS

PDF

45.4 KB Created: 2020-05-14 01:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 52e2d41aaf74216429f0ff903f7dc3d5 SHA-1: bdc96caf3a3b0d46f9849b2a92e732acfb0a57be SHA-256: 6c982c17160e71888a83da9212b60ddf274d5d483dba6a549fe0272e884cc82e
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs further supports this assessment. The document body, though heavily obfuscated, contains references to 'Dental care case study answers' and 'wkhtmltopdf', likely serving as a lure.

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://cecilyeiferle.com/uploads/1/3/0/9/130969172/130969172.html#dental+care+case+study+answers
    • http://kalaharitradingcompany.com/uploads/1/3/0/7/130776580/736036.pdf
    • http://nationalnannytrainingday.com/uploads/1/3/0/7/130776394/8679015.pdf
    • http://2bepotencialhumano.com/uploads/1/3/0/5/130551065/3927907.pdf
    • http://beespiration.com/uploads/1/3/1/4/131406735/vepew-vebip-mesatodenu-rogudidoji.pdf
    • http://gardeningforce.com/uploads/1/3/1/6/131606186/xugupozugujagupopu.pdf
    • http://andrewlloydgordon.net/uploads/1/3/0/2/130270913/wutozuxowodaf_remavinazalob.pdf
    • http://karmafashionwholesale.com/uploads/1/3/0/3/130313414/tubegot.pdf
    • http://khangonline.com/uploads/1/3/0/3/130379316/gigid-konufuk-tilit.pdf
    • http://prettylittlemelts.com/uploads/1/3/1/0/131070737/9835165.pdf
    • http://thecrossinglive.net/uploads/1/3/1/4/131454883/6698511.pdf
    • http://stephaniegallanteportfolio.com/uploads/1/3/0/6/130605426/6563634.pdf
    • http://wccscience.com/uploads/1/3/0/2/130291433/nazuvobo.pdf
    • http://lilafy.com/uploads/1/3/0/5/130546153/romarama-musavapusozad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000083e5.bin
5ee3dfb0dcfc40915b0f8d0eaebd456824bbf737afccb6b72d213747faf4b502		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E5 11116 bytes

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