Malicious PDF — malware analysis report

Static analysis result for SHA-256 de479c200c9b9270…

MALICIOUS

PDF

122.4 KB Authoring application: Karbon
MD5: b4a1ce79067d019546001beb61c7d96c SHA-1: 1e82eac019a7b80bcb24cd48cac2eac4fcb60850 SHA-256: de479c200c9b927092d3dc3f12301b60ed992c41eed8245af87273bfcdfb6dc6
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to external PDF documents, a technique often used for SEO spam or to distribute malicious content. ClamAV identified this as 'Pdf.Phishing.TtraffRobotInstall-7605656-0', and a machine learning classifier also flagged it as malicious. The document body itself is heavily obfuscated but contains references to the same URLs, reinforcing the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9516

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://nekure.omgcolors.com/uploads/2020/01/27/nurixuk.pdf
    • http://omt�nk.se/uploads/1/3/0/3/130313582/sexosu.pdf
    • http://club8inch.com/uploads/1/3/0/6/130603749/mofajabowofo-kumod-kigunolekamonev-jerofubimadova.pdf
    • https://pikimipev.weebly.com/uploads/1/3/0/6/130604333/221331.pdf
    • http://xuguz.shopdochoi.tech/uploads/2020/01/27/gadilaga.pdf
    • http://vadizadu.biohimchistka.ru/uploads/2020/01/29/6783009.pdf
    • http://readymum.com/uploads/1/3/0/2/130287939/tazuwukeranuju.pdf
    • https://kinutepexugupef.weebly.com/uploads/1/3/0/4/130436188/lojiratinifasak.pdf
    • http://mselisewrites.com/uploads/1/3/0/5/130546333/2696904.pdf
    • http://lastfrontiermusic.com/uploads/1/3/0/2/130288006/647158.pdf
    • http://therwcmodel.com/uploads/1/3/0/5/130550684/7828392.pdf
    • http://savelittlechalfont.weebly.com/uploads/1/3/0/6/130603783/9125ee5.pdf
    • http://coldwatermusicschool.com/uploads/1/3/0/4/130483290/130483290.html#rayagada+railway+station+platform

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000125f.bin
5f26b60da432306c45a6fbe0bf87bafdeade8433d708fc141ada6b3700945042		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125F 9724 bytes
font_01_sfnt_off0000b795.bin
2b9095300cbcda42a70fa32414b4d39b9b4c78441cf1e830c0e3562ff72710cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB795 7896 bytes
font_02_sfnt_off0000cb5c.bin
e41030263f15fcd30cdf61cb3529d61d457ec6fcad2222e078280b4704cf8be0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5C 17184 bytes
font_03_sfnt_off000180c5.bin
1723f1ced37cc89d69e30f3df6281c5e5fb8989544fd4587aa75b00c91af2fd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x180C5 1388 bytes
font_04_sfnt_off000187f2.bin
96516b671ab776303767cbdd0b5b09b9e497679b63bb27f3a045b5177ab41318		 pdf-font-stream PDF embedded font (sfnt) at offset 0x187F2 8812 bytes
font_05_sfnt_off00019eab.bin
3c2e106de6cb787409ee9e7a468dbada390938761ac748b466265f884e05639f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19EAB 1960 bytes
font_06_sfnt_off0001a7b6.bin
2c32c498f23db3cae400dac070c72b38d41a5d5dbe5041cbe08e7cee44e1acfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7B6 2648 bytes

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