Malicious PDF — malware analysis report

Static analysis result for SHA-256 44118d7f460f001b…

MALICIOUS

PDF

45.3 KB Authoring application: Mobipocket Creator
MD5: d2e34cfd95e2b57849b155780e143646 SHA-1: 16dec7437d0715063e02ab69bec48a224cc947df SHA-256: 44118d7f460f001b5b374463e9a2701ce7a321c2dbf116638812152e6fb20015
150 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, which detected it as a Pdf.Dropper.Agent. The critical heuristic firing indicates a PDF containing a mass external link farm. The embedded URLs are likely used to redirect users to malicious content or further stages of an attack. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • ClamAV: Pdf.Dropper.Agent-7914592-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7914592-0
  • 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://keppingerlaw.com/uploads/1/3/0/3/130379244/vavomulemoz.pdf
    • http://suejardin.studio/uploads/1/3/0/3/130313022/wezivuro_sesasokelajinow.pdf
    • http://atlweddingstylist.com/uploads/1/3/0/4/130488415/53126591bda8.pdf
    • http://bravohobby.com/uploads/1/3/0/4/130483761/1356474.pdf
    • http://mysp365.com/uploads/1/3/0/3/130313434/wesov.pdf
    • http://nerdypirate.com/uploads/1/3/0/5/130539899/c35ef15cf651.pdf
    • http://tactical17.com/uploads/1/3/0/5/130541221/furovekixufubuw.pdf
    • http://beatricecloakefineart.com/uploads/1/3/0/5/130539325/130539325.html#brucella+spp+wikipedia

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001187.bin
76bfb3cef4645e0c10bff3f6ad2ece7bb65fcbf7e09782638cbd74f480c29efd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1187 9712 bytes

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