Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a37cffc55305848…

MALICIOUS

PDF

35.9 KB Created: 2020-04-11 06:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a8e92e7165ce5da80cbc130a282e1eb1 SHA-1: 0488b2493ae21dbcd8eda4132694ceeeb55c2321 SHA-256: 4a37cffc55305848dcb04d084e2ecf5e24de87c8845b32853696bdf806b3c964
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to other PDFs hosted on similar domains, suggesting a link farm or redirection scheme. The document body text, while partially obfuscated, includes the phrase 'New english file elementary test key pdf' and references wkhtmltopdf, indicating a potential lure to download or access malicious content. The ML classifier strongly flagged this PDF as malicious.

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://shardexplorers.com/uploads/1/3/1/3/131379228/131379228.html#new+english+file+elementary+test+key+pdf
    • http://scihorizon45.com/uploads/1/3/1/0/131070933/bepewobero_jamudejiped.pdf
    • http://teaneckambulance.com/uploads/1/3/1/3/131398423/5812598.pdf
    • http://makergirlz.org/uploads/1/3/0/6/130604821/2535308.pdf
    • http://kevinryan223.com/uploads/1/3/0/5/130589150/rewomaporobuxetabud.pdf
    • http://jackskitchenma.com/uploads/1/3/0/8/130873804/7346054.pdf
    • http://mail.lansingnursery.org/uploads/1/3/0/5/130551859/2cbde4d0231.pdf
    • http://zumsms.com/uploads/1/3/0/7/130738792/6854360.pdf
    • http://earthspinandfire.com/uploads/1/3/0/4/130483329/8786ac3.pdf
    • http://kemcor.org/uploads/1/3/0/5/130540211/b43664728.pdf
    • http://publication-honda-accord.com/uploads/1/3/1/0/131070490/fukefo_riten_xelasexim_tagizepawujowi.pdf
    • http://willietraywick.com/uploads/1/3/0/5/130539758/9339385.pdf
    • http://makergirlz.org/uploads/1
    • 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_off0000646a.bin
f9439c0366e54ca96b7c3c9d7840bdd1d79eacdec51cce62fc43bff4f25fb2a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x646A 7380 bytes

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