Malicious PDF — malware analysis report

Static analysis result for SHA-256 7276fb04451d8417…

MALICIOUS

PDF

123.3 KB Authoring application: QPDF
MD5: 53f69a4c162268ae0f328512419d00e2 SHA-1: f1c0fc50ea82efbef4051cc87e2dd5356f091a82 SHA-256: 7276fb04451d8417a30fb02c2a67d17a7c58eb0763d42b7191d5a094713a4c23
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files, a technique often used for SEO spam or to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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://carrielcopeland.com/uploads/1/3/0/6/130621758/e6aba.pdf
    • http://nothernlightsfarm.com/uploads/1/3/0/2/130271063/59ac6dc4572.pdf
    • http://lottomagico.com/uploads/1/3/0/4/130483477/lamuxinenonid_junudi_ruwelalero.pdf
    • http://kamo.megatest.org/uploads/2020/01/28/2e52c637ce.pdf
    • http://adamrichardsteachingportfolio.com/uploads/1/3/0/4/130488506/sisureziba.pdf
    • http://notesinthemargin.co.uk/uploads/1/3/0/3/130313132/bujunu-tiwubumo-kimirul.pdf
    • http://reboundat.com/uploads/1/3/0/5/130540085/130540085.html#janapada+geete++karo
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000012be.bin
1988b63338daccd2bf07e16ca50caaa9a8fe80ef8d88a710efcc2acfc7757d83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE 8084 bytes
font_01_sfnt_off00019467.bin
aa5c7010093a080f312881c1d72ff753ded86cadea3abc31b70257fb9b45e6f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19467 18156 bytes
font_02_sfnt_off0001af3a.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF3A 1708 bytes

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