Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31784b44f8038a9…

MALICIOUS

PDF

38.5 KB Created: 2020-04-16 06:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8425190cad54bc875b8796ab93d6d4ec SHA-1: 8e9bc15c3c7a6506484bc93606460a721e0053f1 SHA-256: f31784b44f8038a96f63960503ce60ee5bed3c34b1aec29bc49c36306b3b0b49
62 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common technique for SEO spam or phishing. The document body, though heavily obfuscated, contains text related to educational worksheets, suggesting a lure to disguise the malicious intent. The primary heuristic indicates a link farm, pointing to a high volume of outbound links to potentially malicious domains.

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://scrubs4work.com/uploads/1/3/0/3/130379183/130379183.html#context+clues+worksheets+multiple+choice+5th+grade
    • http://nxlevelphysicaltherapy.com/uploads/1/3/0/7/130775443/b45fa089d09bcd.pdf
    • http://sfcyberdefense.com/uploads/1/3/1/1/131163712/nikovip.pdf
    • http://apocalypsescript.com/uploads/1/3/1/4/131483009/mewewizipunagag.pdf
    • http://jodyharrisinc.com/uploads/1/3/0/6/130620417/1244185.pdf
    • http://localmusiclegend.com/uploads/1/3/0/7/130738962/4272045.pdf
    • http://cnie.eu/uploads/1/3/0/6/130620423/9977720.pdf
    • http://berniepotvin.com/uploads/1/3/0/5/130545485/176373a6bf35c1.pdf
    • http://organizeyourlife.site/uploads/1/3/0/6/130604955/6677dd2ae99c.pdf
    • http://galitrip.com/uploads/1/3/1/4/131436977/vibukelalukebex_vofofirogipisav_xiveki.pdf
    • http://rareforms.net/uploads/1/3/1/0/131070096/6189407.pdf
    • http://australiaundiscovered.net/uploads/1/3/1/6/131637483/nedowokedonem.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_off0000702c.bin
35602470ae1f495dc683185eab051591d08b93b4692aa6dd112902c598196b8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x702C 7592 bytes

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