Malicious PDF — malware analysis report

Static analysis result for SHA-256 c74aa4d7138f582e…

MALICIOUS

PDF

36.5 KB Authoring application: Karbon
MD5: 9903640c47af11d91548114a47681ce9 SHA-1: 8300cb5017a67b364ba2a8ff298db89f48563a6f SHA-256: c74aa4d7138f582e5fca5658e55a387ec17af7e3fb2dff5f41e8c3f1679779d0
150 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, for being malicious. The critical PDF_SEO_LINK_FARM heuristic indicates a large number of embedded external links, with the first identified URL being http://surfbeat.com/uploads/1/3/0/6/130639175/3120936.pdf. This suggests the PDF is designed to lure users to malicious content or engage in SEO spam. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://surfbeat.com/uploads/1/3/0/6/130639175/3120936.pdf
    • http://mta-sts.mail.gandersonhomesinc.com/uploads/1/3/0/5/130544134/jexeg-jowalemujulita.pdf
    • http://maviasimmsministries.com/uploads/1/3/0/6/130605182/pagagejum_dinuzinipi.pdf
    • http://amyshadeco.com/uploads/1/3/0/3/130323511/6298241.pdf
    • http://farmfreshmess.com/uploads/1/3/0/8/130813413/veguvilonesugu_pogidexera_letexov.pdf
    • http://hopehelps.ca/uploads/1/3/0/7/130776425/6438391.pdf
    • http://ashleighcrystal.com/uploads/1/3/0/6/130605120/rojamolagidazote.pdf
    • http://properpocketpicker.com/uploads/1/3/0/3/130379681/lirafuwufulubo-gimemik.pdf
    • http://delukabooks.com/uploads/1/3/0/7/130776197/829d99fff20.pdf
    • http://kproyhtiot.net/uploads/1/3/0/6/130620948/1345379.pdf
    • http://samuraiprinciple.org/uploads/1/3/0/7/130738568/b7e0de153a82.pdf
    • http://australianwomeninsurf.com/uploads/1/3/0/2/130288798/fekudesulumitosigaw.pdf
    • http://aivl4l.salon225.com/uploads/1/3/0/7/130740292/130740292.html#dirk+gently%27s+holistic+detective+agency+season+2+episode+2
    • http://hopehelps.ca/uploads/1/3/0/7/130776

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003512.bin
095dbdabd793fe53db465db0356734cdeb68226f7550fd2676bc407207aa080a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3512 8396 bytes

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