Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ea055b8c46826e…

MALICIOUS

PDF

28.2 KB Created: 2020-04-10 04:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ab24d3b90dc2350e21eba1304822e07c SHA-1: 412f0222057296278c4e3c4a5518b95d76c6a777 SHA-256: e1ea055b8c46826e1018ae2df6573022a1b4c3bc92fee12ed702c8a6c5d9b879
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are numerically or generically named and hosted on newly created domains, indicative of a link farm or SEO spamming technique. The document body text, though heavily obfuscated, contains a URL that appears to be a lure for checking tax refund status. The presence of numerous PDF links suggests a campaign to drive traffic to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://speelkoning.net/uploads/1/3/0/4/130483408/130483408.html#check+status+dc+tax+refund
    • http://homerfringe.com/uploads/1/3/0/2/130272403/e36806e638ab497.pdf
    • http://heatherblakecrawford.com/uploads/1/3/1/3/131384173/2a3a2fd3c1a987c.pdf
    • http://basiamehdi2020.com/uploads/1/3/0/6/130620454/9194772.pdf
    • http://exercisewithyourkids.com/uploads/1/3/0/6/130639107/rajijikaxotekiv.pdf
    • http://wakinghopeband.com/uploads/1/3/0/7/130739197/6e8b51.pdf
    • http://omnecomm.com/uploads/1/3/0/5/130550841/b2b13.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_off000048cb.bin
59b8f1375ec2790b759f4d42ab0653f95f7ac4df80e28bbef931aa29c00cf47e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48CB 6584 bytes

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