Malicious PDF — malware analysis report

Static analysis result for SHA-256 4830d32e3c88ee58…

MALICIOUS

PDF

40.4 KB Authoring application: Inkscape
MD5: f1d2302e302d5cbd4f0c61caa8772f31 SHA-1: b6749cc2c8d1350263b843c92b97e26aa10abb2f SHA-256: 4830d32e3c88ee580df43ac5239a5f26bcc64cddbb82a73d0b7fe81156a4bd91
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this file as malicious. The document body, though partially corrupted, contains text related to 'teaching writing skills esl', which may be a lure. The primary attack pattern involves directing users to a network of external PDF documents.

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://oslorelocationservices.com/uploads/1/3/0/2/130273589/5505702.pdf
    • http://agelessiq.com/uploads/1/3/0/3/130313103/norebe.pdf
    • http://scientificdirections.com/uploads/1/3/0/6/130621405/5255900.pdf
    • http://countylinelogisticscenter.com/uploads/1/3/0/2/130291786/suwolafote-tobira.pdf
    • http://misssupremepurityqueen.com/uploads/1/3/0/6/130639140/130639140.html#teaching+writing+skills+esl

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00000fcd.bin
7e04ae76a18c2146305b42f40c6f48dbecfcd13bbe131316eec3b377ed066249		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD 7672 bytes
font_01_sfnt_off000057e4.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57E4 16036 bytes

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