Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b837a2dbae6c0d…

MALICIOUS

PDF

42.1 KB Authoring application: Karbon
MD5: 516e34cf02721c7de5df1d9a83578079 SHA-1: 215c70f44eb41014682b80179250c9ba6f8d00f7 SHA-256: 61b837a2dbae6c0dfbc01a85f5f69441db5ecebbd9a5d98b38231a2b237cdb99
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files, a technique often used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The embedded URLs are the primary indicators of compromise.

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://metcalfe4pa.org/uploads/1/3/0/4/130491356/wazutiba_fanipaj.pdf
    • http://servitusstudios.com/uploads/1/3/0/6/130639310/wasaxaxibax_firimuposigilun.pdf
    • http://moosemanormi.com/uploads/1/3/0/4/130476672/kalabetexokexakuwu.pdf
    • http://myacrepairorlando.com/uploads/1/3/0/5/130588811/71e4361567864.pdf
    • http://josep.festivalweer.com/uploads/2020/01/28/gavixukabofakikeguri.pdf
    • http://migrationbot.ca/uploads/1/3/0/3/130313316/jizegoja.pdf
    • http://robertelsner.com/uploads/1/3/0/5/130589384/kiwazoxirose.pdf
    • http://websiteseoshop.com/uploads/1/3/0/7/130739197/3579249.pdf
    • http://kamowijuva.manuolog.net/uploads/2020/01/28/movezosotajel_gedunabodo_noketoseloga_pemaziga.pdf
    • http://aedutah.com/uploads/1/3/0/5/130543941/1323024.pdf
    • http://arlencollisioncenter.com/uploads/1/3/0/7/130776054/bawinipobokikofupiba.pdf
    • http://nationalfootballcheerleadersalumni.org/uploads/1/3/0/6/130639551/130639551.html#prescott+microbiology+textbook+pdf+download

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000014f4.bin
b017a882dce5d9621acb26f95c368c04af4bb53137fb41b8778ebf980a19b4a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F4 8140 bytes
font_01_sfnt_off00006a54.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A54 1708 bytes

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