Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1c11dbcf0d081c…

MALICIOUS

PDF

38.6 KB Authoring application: Mobipocket Creator
MD5: 02320e5242f10f37853dec0c8ba8bcea SHA-1: dec4e5c115fccc2e70a4fdcd07723ed58dd8640b SHA-256: 3d1c11dbcf0d081ca09d0ba445bd3914c406bb733feab8b30c17bc15e68f0504
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO poisoning or to redirect users to malicious sites. ClamAV and ML classifiers flagged this as malicious, specifically identifying it as phishing-related. The document body itself is largely obfuscated but contains references to the embedded URLs, suggesting a lure to external content.

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://mobileplantmanagement.com/uploads/1/3/0/6/130604952/6504299.pdf
    • http://msfishsclass.weebly.com/uploads/1/3/0/6/130639763/96b971584.pdf
    • http://premierrecruiting.net/uploads/1/3/0/5/130551235/fosefurepi-kugilujilevite.pdf
    • http://fujakarub.fastforcash.xyz/uploads/2020/01/28/zagigenemefo.pdf
    • http://boonesushi.com/uploads/1/3/0/7/130739029/toposux.pdf
    • http://oliviadummer.com/uploads/1/3/0/2/130274146/1770916.pdf
    • http://thehnossaproject.com/uploads/1/3/0/4/130436188/130436188.html#grammar+crossword+possessive+adjectives+and+pronouns

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000113e.bin
cfa01d9128585cd8e0fd5ed4933430f29e397520b8ac26346ee8d6341c265b99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113E 8420 bytes
font_01_sfnt_off00005082.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5082 16036 bytes

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