Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb2fc3f2131b6b12…

MALICIOUS

PDF

38.3 KB Created: 2020-03-08 11:17:52 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c094de200f958634cc9a8d5270823ad2 SHA-1: 5ee8378f8e74bd8aa068b356d3c2ab1e657a52db SHA-256: bb2fc3f2131b6b12dac0f05cbbdc49001ce4b219d4601e82da4000318eb81328
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named and hosted on unrelated domains, indicating a link farm or SEO manipulation tactic. The document body, though partially corrupted, contains references to 'English grammar wh questions pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://irieint.com/uploads/1/3/0/3/130313641/130313641.html#english+grammar+wh+questions+pdf
    • http://remiowen.com/uploads/1/3/0/3/130323659/dolijogajeko.pdf
    • http://tenescreations.net/uploads/1/3/0/6/130639357/2543478.pdf
    • http://mystoretrackr.com/uploads/1/3/0/4/130491271/09288.pdf
    • http://coltsound.com/uploads/1/3/0/2/130288673/7582300.pdf
    • http://www.pagesfermentationsupply.com/uploads/1/3/0/4/130488469/mogufag-jawus.pdf
    • http://monefeldts.com/uploads/1/3/0/6/130639126/148008.pdf
    • http://9roundmemphis.com/uploads/1/3/0/3/130323302/cc6f1840d4b2.pdf
    • http://corecdinc.com/uploads/1/3/0/6/130604295/db1abaf.pdf
    • http://naturalbalancetherapies.org/uploads/1/3/0/4/130488244/raparun-dorujatopevuxi-gebibadatuj-livem.pdf
    • http://pcbchain.co.uk/uploads/1/3/0/8/130814347/696a436504.pdf
    • http://www.blendnutritionco.com/uploads/1/3/0/8/130874139/jepalexiku-luvefaraguvoka-vinebunos.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_off00006e12.bin
77da08370855569c86ad15d14dc9bf6ba58f86725848ee2076c631cbe835e3f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E12 7792 bytes

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