Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8031737ed92e599…

MALICIOUS

PDF

40.1 KB Authoring application: Poppler-utils
MD5: 995a7d7f67d6cb6a09ee4ee9bd6d67c3 SHA-1: a3f9dfc3fc313f80c271c22edda8490d2b970fd0 SHA-256: c8031737ed92e599305a5efc0509424922fd07e7afb05745c12c5fd381bc1a2f
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique commonly used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies the mass external PDF link farm as a critical finding, with the dominant host being 'regionc.swe.org'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://freelas.net/uploads/1/3/0/7/130775928/bagurarerad.pdf
    • http://southbankcuaco.com/uploads/1/3/0/6/130620574/fokodasu.pdf
    • http://autodiscover.thesmilinggoat.com/uploads/1/3/0/5/130588810/a4405bfe754.pdf
    • http://inklingsacademy.net/uploads/1/3/0/7/130739478/teribalatuzok.pdf
    • http://www.kandicetanner.com/uploads/1/3/0/2/130289632/nikigitobebiri.pdf
    • http://flatlandtrailrunner.net/uploads/1/3/0/4/130476791/cd88bdd87415b29.pdf
    • http://cxotoolkit.com/uploads/1/3/0/6/130621228/3475978.pdf
    • http://truthhealsus.com/uploads/1/3/0/7/130740250/9cdac9f5.pdf
    • http://www.nomadedservices.com/uploads/1/3/0/7/130775510/f1df084f07d.pdf
    • http://michaeloharagarcia.com/uploads/1/3/0/5/130588518/afb697c4d87a5d.pdf
    • http://softwarehabits.net/uploads/1/3/0/7/130775589/5866099.pdf
    • http://dietreview.info/uploads/1/3/0/3/130379307/1fccc18df795.pdf
    • http://bicycleprintco.com/uploads/1/3/0/7/130739170/2118204.pdf
    • http://www.katemccaffreydo.com/uploads/1/3/0/6/130603968/771689.pdf
    • http://sancarloshotel-portuguese.devsite-1.com/uploads/1/3/0/6/130639164/130639164.html#reduction+of+adjective+clauses+pdf
    • http://michaeloharagarcia.com/uploads/1/3/0/5/130588518/afb697c4d87a5d.pd
    • http://regionc.swe.org/uploads/1/3/0/2/130272348/9278171.pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004155.bin
8844ec64b9fac5f9af4a3cb1b26a2a50678f7306232b42a850e78e15e13add65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4155 8320 bytes

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