Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b78fd36362b617…

MALICIOUS

PDF

39.1 KB Authoring application: Smallpdf Desktop
MD5: e0e379368fc1496cb791284c7ba151e0 SHA-1: 8eb9c2e349304773564170a29366aef2bb114dfe SHA-256: d7b78fd36362b61773ff6392c46fcc99d592efaf44544246aa497a8c38c19bbb
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, for malicious content. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, with the first being https://nisevade.weebly.com/uploads/1/3/0/2/130273915/258e8d.pdf. The document body attempts to disguise its malicious intent by appearing as a job application sample. 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.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 https://nisevade.weebly.com/uploads/1/3/0/2/130273915/258e8d.pdf
    • http://youthbuildillinois.org/uploads/1/3/0/2/130274371/64eab4939c.pdf
    • http://norcalsquirrels.com/uploads/1/3/0/6/130620263/puxagopakir_sipowu_bakewoterukatof_fumuluxoxijebi.pdf
    • http://bsatroop255.weebly.com/uploads/1/3/0/6/130639115/bereboxa.pdf
    • http://josephwalker.net/uploads/1/3/0/3/130313037/vobukebe.pdf
    • http://unhappycamperstudios.com/uploads/1/3/0/6/130620574/polidixijetos.pdf
    • http://rebeccalaplacaattia.com/uploads/1/3/0/7/130776056/130776056.html#sample+cover+email+for+job+application

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001181.bin
dfb66b0145f5281e6e99513b13d76535b53f5e75fae6ddc7c948b73888a67bc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1181 8824 bytes

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