Malicious PDF — malware analysis report

Static analysis result for SHA-256 87764cee8d7fad84…

MALICIOUS

PDF

49.9 KB Created: 2020-03-28 05:15:06 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 98acc58e22d500e9a32db125d2c1ec5a SHA-1: 636c970b380cb8c5e51a9b387ca4a730702554df SHA-256: 87764cee8d7fad84c3474467157e3b5fcd40e44f8c8071119d40656753f57877
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. The ML classifier strongly supports this assessment. No scripts were extracted, but the presence of numerous URLs indicates a likely redirection or SEO poisoning attack.

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://purerockcolours.eu/uploads/1/3/0/5/130543568/130543568.html#conversor+de+unidades+pascales
    • http://vizualpost.net/uploads/1/3/0/6/130604536/3202619.pdf
    • http://data4g.net/uploads/1/3/0/7/130776033/1135664.pdf
    • http://zcbcspfld.org/uploads/1/3/0/6/130621654/4501760.pdf
    • http://womeninthekitchen.com/uploads/1/3/0/7/130739308/5f4e2309a65073.pdf
    • http://moannasworkroominteriorsandstaging.com/uploads/1/3/0/7/130738721/rigebewase.pdf
    • http://home-loans-perth.com.au/uploads/1/3/0/6/130605285/saxataruzorudusofis.pdf
    • http://lagosjobsite.com/uploads/1/3/0/6/130604176/eafd6.pdf
    • http://mycleanohio.com/uploads/1/3/0/6/130604091/0285a17cb60d.pdf
    • http://downtheaisleweddingconsulting.com/uploads/1/3/0/6/130639395/repurex-lalefavoga.pdf
    • http://wholehealingbodyworks.com/uploads/1/3/0/6/130603969/bbf69de1c01b.pdf
    • http://belleviellc.com/uploads/1/3/0/7/130775451/f83a1da9775749.pdf
    • http://www.firecracker100k.com/uploads/1/3/1/1/131164034/xezok-lazutim-dimalur.pdf
    • http://mijn-maatschappij.nl/uploads/1/3/0/7/130739635/3b3f372cb.pdf
    • http://www.gruyaertkarel.com/uploads/1/3/1/0/131070355/8005fa8.pdf
    • http://scoopsphotography.com/uploads/1/3/0/4/130435638/2b497a4a23e679d.pdf
    • http://skylinedc.org/uploads/1/3/0/2/130287881/xafadabodez.pdf
    • http://prime-yourself.com/uploads/1/3/0/8/130874681/tedopisaxomin_fovizaweri_fanan.pdf
    • http://tasteparty.jpjsweets.com/uploads/1/3/0/6/130604863/bibekugosox-vebuv-jumorinivo-monofu.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007930.bin
4ccce3cd5951cd4c649df1e2b943b30d3013a20ea89819be3a794580ecbb4e62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7930 8596 bytes
font_01_sfnt_off000098a2.bin
cee65658e3d26ef8246f9215c59d9446543a75e15d271caf41ca83b5ba263201		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98A2 2940 bytes
font_02_sfnt_off0000a2b2.bin
42fec308b7cab2f393414e9bdc1a6bd25b4aa0b9070acde390e3b63ffb91afd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2B2 16100 bytes

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