Malicious PDF — malware analysis report

Static analysis result for SHA-256 f862d54d9827c0c3…

MALICIOUS

PDF

43.1 KB Authoring application: LibreOffice
MD5: 0acb5cb21c5eb1cdb52b4f242e889ccd SHA-1: d4a3fdc77805fc1e0f21b7debb28a3b826187b7e SHA-256: f862d54d9827c0c351387bbaab55b1b2cc84ca4ac0087509e7200930f74e3269
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier also flag this as malicious phishing content. The document body appears to be corrupted or truncated, providing no direct user-facing lure, but the sheer volume of external links suggests a coordinated effort to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9823

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://positively-jewish.org/uploads/1/3/0/6/130621591/kitinoxedimi.pdf
    • http://oakdalepoolservice.com/uploads/1/3/0/5/130550980/palagesep.pdf
    • http://pacificcoastbuyers.com/uploads/1/3/0/5/130588977/9505986.pdf
    • http://neneliciouslingerie.com/uploads/1/3/0/6/130605159/025f6d8c4.pdf
    • https://pogejumovev.weebly.com/uploads/1/3/0/3/130323417/gaxewuxir_wuvowomukukagam.pdf
    • http://soulcraftmans.com/uploads/1/3/0/7/130775743/mawojibozon_tujuneni_jaxaguwum.pdf
    • http://5pointauto.com/uploads/1/3/0/4/130476054/130476054.html#hotel+california+intro+tab+capo+7

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004273.bin
314a863521bf4eebf494576b1d54a77f903e8eac9550a58a1096c578c20ebc6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4273 8880 bytes

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