Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfaed8d8b9e595df…

MALICIOUS

PDF

34.6 KB Created: 2020-05-14 06:39:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ec0de6fa9de1d2386cf8e14817031f03 SHA-1: c715ebaf840bf3e61cb90ea3b971b3f1e7785322 SHA-256: dfaed8d8b9e595dfe0a854dac9932a0410ccbdbc346ce0abd4c4ef515ddd007b
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains text related to '6 times tables printable worksheets' and mentions the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious link farm. The primary attack pattern involves directing users to a multitude of external PDF resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://youniquebysherrygibson.com/uploads/1/3/0/8/130874179/130874179.html#6+times+tables+printable+worksheets
    • http://fullgospel.org.hk/uploads/1/3/1/0/131070147/jusaxuduwure.pdf
    • http://jjcleaningdrywall.com/uploads/1/3/0/7/130775291/segobidekewebol.pdf
    • http://lindamodernart.com/uploads/1/3/1/0/131070571/147dcc9a96549.pdf
    • http://armdoneright.com/uploads/1/3/0/2/130272585/gutofutaba.pdf
    • http://sellyourhomeintucson.com/uploads/1/3/0/6/130639889/xijofopaxifiwazorexe.pdf
    • http://shopluckybamboo.com/uploads/1/3/0/9/130969061/2790a625.pdf
    • http://sellectsourceintl.org/uploads/1/3/0/5/130546742/senan.pdf
    • http://lookforkind.com/uploads/1/3/1/8/131860204/loxepifigip.pdf
    • http://qualitycleaningtoday.com/uploads/1/3/1/3/131379392/6842751.pdf
    • http://ktadesigns.com/uploads/1/3/0/3/130379589/nekaxakazogu.pdf
    • http://astrologystics.com/uploads/1/3/1/6/131606407/2274831.pdf
    • http://woulibamrestaurant.com/uploads/1/3/0/7/130776564/wevuvub.pdf
    • http://klassiekindestad.be/uploads/1/3/0/5/130539097/labomedotigivof_pewafizi_taxinoja.pdf
    • http://castingtopwomen.com/uploads/1/3/0/8/130874359/820973.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_off00005b8d.bin
847f09f87a7231e8cd9057f2a3d30ad25e2a7e9605bd2a05099c2886ecb142dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B8D 10416 bytes

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