Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a761f7b718ce968…

MALICIOUS

PDF

43.4 KB Authoring application: Inkscape
MD5: dd2929d1c25e0fb40fc1f6bef98a9b97 SHA-1: 53c2ec9afeee33dc814c913ef083c56d3df927b3 SHA-256: 5a761f7b718ce96893970f610f30f319bba03410a2f92674f5e7ea7c9cf27292
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of embedded URLs pointing to external PDF files, as indicated by the PDF_SEO_LINK_FARM heuristic. This technique is often used to manipulate search engine rankings or to distribute malicious payloads. The ClamAV detection and ML classifier further support its malicious nature. 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://princeofbarkness.com/uploads/1/3/0/6/130620917/muketapalura.pdf
    • http://creativetrekkie.com/uploads/1/3/0/2/130271212/zuvoxisad.pdf
    • http://tekuwasok.comparateurdesbanques.com/uploads/2020/01/28/48571463a32.pdf
    • http://mindactionplan.com/uploads/1/3/0/6/130621421/a67aac20b05a78.pdf
    • http://accipiterbikes.com/uploads/1/3/0/5/130588693/kenamamawufegofuz.pdf
    • http://nickjanelandscape.com/uploads/1/3/0/6/130621208/3905263.pdf
    • http://sonomacountyhardmoneyloans.com/uploads/1/3/0/7/130739347/6623814.pdf
    • http://cakenetwork.us/uploads/1/3/0/6/130639231/2542892.pdf
    • http://xiaodiya.com/uploads/1/3/0/6/130639895/8241038.pdf
    • http://sjb-productions.com/uploads/1/3/0/5/130551967/sibozuji-kinaben-kozoronotubak-sowogumodefis.pdf
    • http://adamsoilcompany.net/uploads/1/3/0/6/130621749/130621749.html#contemplated+change+order+sample
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001284.bin
f699ab33a342e64486557116ab2a20d5e8be2a636f4248428139897d6ebe0e8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1284 8384 bytes
font_01_sfnt_off00006ed2.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED2 2652 bytes

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