Malicious PDF — malware analysis report

Static analysis result for SHA-256 279af5be6fe1dfe0…

MALICIOUS

PDF

46.9 KB Authoring application: LibreOffice
MD5: c050be7de263abdde61531828357363c SHA-1: db33a90656ed1240e7455bd1d4ad41dcffe20775 SHA-256: 279af5be6fe1dfe0facdc0b2e858d7335ec170410b31ed28168fec51e3fae6ca
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs pointing to other PDF files hosted on various domains, a technique commonly used for SEO poisoning or distributing malicious content. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to these URLs, reinforcing the link-farming attack pattern.

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://norcalpomskies.com/uploads/1/3/0/3/130324289/7489400.pdf
    • http://boonesushi.com/uploads/1/3/0/5/130540882/4345671.pdf
    • http://almostasecondgrader.com/uploads/1/3/0/5/130550998/3349700.pdf
    • http://brushlove.ca/uploads/1/3/0/7/130776734/joxokosutisuvim.pdf
    • http://digital-human.org/uploads/1/3/0/6/130639412/13117.pdf
    • http://risechildrenschoir.org/uploads/1/3/0/6/130620453/wizoluwija.pdf
    • http://djspizza1.com/uploads/1/3/0/3/130323337/130323337.html#autocad+civil+3d+drawing+compatibility

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000130b.bin
32d3c9e0f6752bec031f6bc9b0293b53b0bc82771fd184582ac4a42d1dbfbf9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130B 9400 bytes
font_01_sfnt_off000075c0.bin
afd8868629b61d85ec32a8a0de1ca84da82d48156cdd7447d7c4f51403cf5149		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C0 5244 bytes

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