Malicious PDF — malware analysis report

Static analysis result for SHA-256 1692cc234ca6ed69…

MALICIOUS

PDF

39.9 KB Created: 2020-03-29 22:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d8b7750cdac8f3ccf69d90f089563324 SHA-1: 88ba1e93aed2044dac7852ecd677f7b01f0c6fce SHA-256: 1692cc234ca6ed694de6e4cce5ebe777ca88dc2c58331b5caaf0f112cf26cc0d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded external links, identified by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern appears to be directing users to a network of external websites, likely for SEO spam or to host further malicious content.

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://aldensuites.devsite-1.com/uploads/1/3/1/4/131406562/131406562.html#obi+wan+jedi+fighter+lego
    • http://kyrateis.com/uploads/1/3/0/6/130620857/1137037.pdf
    • http://hairbraidingbymichele.com/uploads/1/3/0/7/130775902/9503287.pdf
    • http://jillskupinburkholder.com/uploads/1/3/0/2/130272977/042e1deef.pdf
    • http://revolutionpoledance.com/uploads/1/3/0/2/130289338/nukugunogafozup.pdf
    • http://prohibitioncannabis.ca/uploads/1/3/0/2/130289688/pudibokogawoli.pdf
    • http://pshandcrafted.com/uploads/1/3/0/7/130739897/turodukizosip_kiletoxam_julilokuvajike_tadafu.pdf
    • http://jenlynns.com/uploads/1/3/0/8/130874516/tovapojetofoxuf-tubutexu-nujogoxuwaj-famejofumemo.pdf
    • http://keepthechangeentertainment.com/uploads/1/3/0/7/130739312/1428455.pdf
    • http://ricochetroyal.com/uploads/1/3/0/4/130483520/1155642.pdf
    • http://achieveconsulting.co/uploads/1/3/0/6/130604516/mejutezep.pdf
    • http://nakayamaus.com/uploads/1/3/0/6/130621698/logedawup.pdf
    • http://plankandforge.com/uploads/1/3/1/3/131379221/pomokapalal.pdf
    • http://bellstarmarketing.com/uploads/1/3/0/5/130540178/sodozazejel-puzemidiziza-pudorofo-zuzuzi.pdf
    • http://hazelmoonstitches.com/uploads/1/3/0/5/130590353/fb7127b59a.pdf
    • http://tekadocesgourmet.com/uploads/1/3/0/2/130291489/xutapusewi-gaporukosoke-saniweka.pdf
    • http://saitbah.com/uploads/1/3/0/6/130621294/dozosawo_bepegevajim_wakerepujobove_rininifowogalar.pdf
    • http://susan-f-harrison.com/uploads/1/3/0/3/130323253/9d227.pdf
    • http://lowcarbladipoet.com/uploads/1/3/0/5/130546333/817193.pdf
    • http://bricdesign.com/uploads/1/3/0/6/130603769/sesowumutugo.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_off00007014.bin
2c1448eec6611ce86387666d217050a1e83947812623d3f96edc3aa462f5e223		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7014 8976 bytes

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