Malicious PDF — malware analysis report

Static analysis result for SHA-256 5375dc850d0fc527…

MALICIOUS

PDF

51.0 KB Authoring application: Nitro PDF
MD5: 97e3178963f0f0b4a700f4fa0d60b618 SHA-1: fe2d966cce5719a6460518e8af854a35bcddadd9 SHA-256: 5375dc850d0fc52766216391e878c93ce42d7bd3f519c2f1320065723a663923
150 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.TtraffRobotInstall-7605656-0 and a machine learning classifier. The critical heuristic PDF_SEO_LINK_FARM indicates the presence of a link farm pointing to external PDF files, with the primary URL being http://banvej.dk/uploads/1/3/0/6/130620438/6766534.pdf. The document body contains references to Excel functions and embedded URLs, reinforcing the idea of a lure to external content.

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.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://banvej.dk/uploads/1/3/0/6/130620438/6766534.pdf
    • https://gadefekurapunus.weebly.com/uploads/1/3/0/6/130604536/36e2b538b405.pdf
    • http://bbytransienthouse.com/uploads/1/3/0/5/130543798/0df9a7df.pdf
    • http://themarylandweddingmarketplace.net/uploads/1/3/0/4/130476798/sazobupefumefoman.pdf
    • http://charitysalon.org/uploads/1/3/0/6/130639203/zipovifijo_tevanura_vuxowegogasox_xuzowuko.pdf
    • http://thesupporthelp247.com/uploads/1/3/0/3/130323116/4473577.pdf
    • http://edgelandscapeandmaintenance.com/uploads/1/3/0/5/130588754/130588754.html#indirect+function+excel+worksheet

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010d6.bin
1b0ce3e27a396df1c4485da31b4fd4b6b95d44df000b4f31460d6322a85e3b81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6 9280 bytes

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