Malicious PDF — malware analysis report

Static analysis result for SHA-256 0835c5599f062049…

MALICIOUS

PDF

36.3 KB Authoring application: OpenOffice.org
MD5: d8f81e1ebfb88f42d08e217e47af009e SHA-1: c826842d6ff623e533de5182f7149619363723c1 SHA-256: 0835c5599f062049e489cd85a13c57fd75726a90e3f3c0641207dd04b144077d
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links that lead to external domains, a common tactic for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The document body, while containing seemingly innocuous text about exercises, is used as a lure to encourage users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://unityofstockton.com/uploads/1/3/0/5/130588678/vobilekovaxezo_kepirij_widojekap_sadamodixiwa.pdf
    • http://tonysaladinobaseballtournament.com/uploads/1/3/0/3/130323523/likope-luxisegipapuda-ronurufobisanew.pdf
    • http://michelevevang.com/uploads/1/3/0/5/130539085/6871524.pdf
    • http://ankezimmermann.ca/uploads/1/3/0/5/130550827/130550827.html#plantar+fascia+exercises+aaos

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001010.bin
ba447d4a25a194ddf45777cb44316a546b11d07027e55f4aa7d5a85ed9702a7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1010 7992 bytes

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