Malicious PDF — malware analysis report

Static analysis result for SHA-256 d391545aa0fb811c…

MALICIOUS

PDF

35.6 KB Created: 2020-04-17 08:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d049053c33d80a40a83f3bebf969a346 SHA-1: 2f0ec7b07a7814942c09473ad17c28470b6a018a SHA-256: d391545aa0fb811ca273863c42a3f919ad64056a9efdfec553f502bc2fdaee91
92 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'Microsoft excel calendar template' and URLs that are structured similarly to SEO-driven content farms. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is part of a campaign to drive traffic to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://beyoutifilyflamless.com/uploads/1/3/1/4/131483061/131483061.html#microsoft+excel+calendar+template
    • http://swiss-plot.ch/uploads/1/3/0/5/130544672/3311478.pdf
    • http://oceanafamilyliteracy.org/uploads/1/3/0/7/130774964/wogexujipimobazoseju.pdf
    • http://harelaw.com/uploads/1/3/0/2/130289515/7507053.pdf
    • http://shannajones.org/uploads/1/3/0/4/130483961/nasevax.pdf
    • http://dx3dlt.co/uploads/1/3/1/6/131607131/piwivafek-wunikigu-motuveforoturol-fejozus.pdf
    • http://issuemag.net/uploads/1/3/0/4/130436492/wiribine.pdf
    • http://fintoro.com/uploads/1/3/0/3/130323103/tibegijomowofakeve.pdf
    • http://greglewismagic.com/uploads/1/3/0/5/130589385/2f42f712e322.pdf
    • http://gibsonburgchurch.com/uploads/1/3/1/1/131163760/43246eb7.pdf
    • http://chicotranslations.com/uploads/1/3/1/4/131452839/wesepitimevawud_fopel_mekeroza.pdf
    • http://takwenyatourssafarisltd.com/uploads/1/3/0/2/130289775/xafomi-jilaw.pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072d8.bin
be32ca87b1abd20f21e7a821b369190e0bc1cd2a3b873b364b08bdf07f99f77b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D8 7500 bytes

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