Malicious PDF — malware analysis report

Static analysis result for SHA-256 4783b7da28962bf7…

MALICIOUS

PDF

58.7 KB Authoring application: LibreOffice
MD5: 6c87f8ec52cd1513d20f7b8deb355f47 SHA-1: 3b63f4b4237fb7f958bd2b92175c251eb50a3f4e SHA-256: 4783b7da28962bf7150f1a0fb9e895764b58688309b6de66f76de8fa100b7202
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs pointing to external PDF files, a technique often used for SEO poisoning or to host phishing content. The heuristic 'PDF_SEO_LINK_FARM' directly indicates this behavior. Additionally, the 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests that the document may be intended to trick users into believing they need a password to access an archive, further indicating a phishing or social engineering attempt. The ClamAV detection confirms the malicious nature of the file.

Heuristics 4

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://notanuffibizans.com/uploads/1/3/0/2/130289426/5991838.pdf
    • http://nudevember.net/uploads/1/3/0/5/130551049/4540154.pdf
    • http://nogenetix.com/uploads/1/3/0/5/130551517/tojenatekumana.pdf
    • http://kexig.rusfermer.info/uploads/2020/01/28/3ffd0310e0.pdf
    • http://cioga.com/uploads/1/3/0/6/130621436/zexulibo.pdf
    • http://peristeri-guide.com/uploads/1/3/0/7/130776814/visoxikakaver.pdf
    • http://pickledpretty.com/uploads/1/3/0/5/130539366/ritivopinos.pdf
    • http://acouturelife.com/uploads/1/3/0/5/130550951/130550951.html#adobe+captivate+9+full+crack

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011a7.bin
398dfa8d17f4015ae83940033aabcd641ed83d00c01dcfd0e5f5ac5a615b1a0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7 8988 bytes
font_01_sfnt_off00007416.bin
ca889182d22413b1a5b6446cd5d954c095bfc2c8b2fec1022b19199100617195		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7416 16028 bytes
font_02_sfnt_off00008a51.bin
54e87b77015f26f8c17b1da921612bd4256e828644f324da0fdbe990cdc6d15f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A51 19028 bytes

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