Malicious PDF — malware analysis report

Static analysis result for SHA-256 44161045d8a7d42b…

MALICIOUS

PDF

43.4 KB Created: 2020-04-08 13:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ea829a28495ae3083cda2d2c42360697 SHA-1: bb99a11627b0eaefcb348ae7d8d9f8cf62c7e7d9 SHA-256: 44161045d8a7d42bd0e2a832bac7dae1469b81de005b9926889288bfedf0c9ba
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains numerous external links, many of which are numerically or generically named PDFs hosted on various domains, suggesting a link farm or SEO spam operation. The document body text, while partially corrupted, includes 'Operaciones aritmeticas basicas excel' and references wkhtmltopdf, indicating a potential lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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://greensleeve.store/uploads/1/3/0/5/130588769/130588769.html#operaciones+aritmeticas+basicas+excel
    • http://ellcclub.com/uploads/1/3/0/4/130436450/b9a2ae68a0a321b.pdf
    • http://onandoffsa.com/uploads/1/3/0/2/130289353/9566189.pdf
    • http://jaddellconstruction.com/uploads/1/3/1/3/131398313/gedezovogugasim.pdf
    • http://medquipltd.com/uploads/1/3/1/4/131406413/nudifuzipumuni_poxesukegog.pdf
    • http://oakroaster.com/uploads/1/3/0/7/130739996/4972672.pdf
    • http://barbersplus.com/uploads/1/3/0/7/130775527/rawedopobasaso.pdf
    • http://evironmentalcampprogramplanningguide.com/uploads/1/3/0/4/130435813/tasivax-xosovuxula.pdf
    • http://maindogpetresort.com/uploads/1/3/0/6/130604720/miwutalupapabu.pdf
    • http://catchavibetv.com/uploads/1/3/0/8/130874513/rafigaboguvalu-xivoval-zikabopogawik-genopu.pdf
    • http://hoiann.com/uploads/1/3/0/7/130776001/8800546.pdf
    • http://haljohnston.com/uploads/1/3/0/5/130544826/bejufi.pdf
    • http://southernrootsco.org/uploads/1/3/0/7/130740206/e32e321.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071c9.bin
2ffd439483b68534ffc2d3ff5c01d1348486e286ef3fc24ec3b9c6a30b0bd7c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C9 9784 bytes
font_01_sfnt_off000094db.bin
985cbd9ba5b629f1b749d04d852c0eecb5d8ad374186a1044a60da9476420dc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94DB 2788 bytes

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