Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d8d0574e757155…

MALICIOUS

PDF

35.4 KB Authoring application: LibreOffice First seen: 2020-09-04
MD5: 96e357d2e59bde916d07a0bfd9554345 SHA-1: a8956c64b56ed82ab1ba4744b9de25648662626a SHA-256: b4d8d0574e7571555ef472fcac202c44720cdc3a646f4a1c4f7ee1698f34fa2b
192 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to other PDF files. The ClamAV detection as Pdf.Phishing.TtraffRobotInstall-7605656-0 and the ML classifier output further support a malicious classification. The embedded URLs are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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.
  • 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://dearservices.weebly.com/uploads/1/3/0/5/130590051/nofelibixavexeda.pdf In PDF document text
    • https://vigubepunufebas.weebly.com/uploads/1/3/0/5/130588716/7716799.pdfIn PDF document text
    • http://acarroll-wallace.com/uploads/1/3/0/6/130605353/janipe.pdfIn PDF document text
    • http://neurodevelopmentandhealingbydesign.com/uploads/1/3/0/3/130323251/130323251.html#aspen+plus+v11In PDF document text

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00000fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7 8512 bytes
SHA-256: 4fcb37b8776c1c9069a18525f8f3576ce2b3f56a2674449fa796c80a1446253b

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