Malicious PDF — malware analysis report

Static analysis result for SHA-256 c882e283ea3a34d8…

MALICIOUS

PDF

43.9 KB Authoring application: QPDF
MD5: 256a754654fc02920223827943d55d20 SHA-1: 39cb619c25a4109c8833a835592a9f04ef13e41d SHA-256: c882e283ea3a34d87c63d73d32fe02ea0fbf7c1038cf5011493e6411421f9a8d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm for SEO or malicious redirection. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to 'online conversion of doc to pdf format' and lists multiple URLs, reinforcing the lure of a PDF conversion service to mask the delivery of malicious 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://liwuju.aewjasw.icu/uploads/2020/01/28/d2dce6e1d.pdf
    • http://aandeapothecary.com/uploads/1/3/0/2/130271229/detomos.pdf
    • http://naxorijif.urogorod.ru/uploads/2020/01/28/8210079.pdf
    • http://ahemartcollective.com/uploads/1/3/0/4/130489499/22d194067c3cbd2.pdf
    • http://nomadfoodtruck.com/uploads/1/3/0/5/130590339/nuzejerir_lilinexiberi.pdf
    • http://jajigu.hospitalnaluri.com/uploads/2020/01/27/1422380.pdf
    • https://xutejifolupo.weebly.com/uploads/1/3/0/2/130289186/kuvagam.pdf
    • http://spatzen.hu/uploads/1/3/0/5/130589165/jezudomojur-potas.pdf
    • http://nobuhotelriyadh-fullsite.devsite-1.com/uploads/1/3/0/2/130289549/130289549.html#online+conversion+of+doc+to+pdf+format

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011d5.bin
b6d8b0b9a97d6ddff7aad293e17c86e42f33260d1763a01b9fd30c4a4690d15b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5 8968 bytes
font_01_sfnt_off0000549c.bin
1957428794578a072b8983e864e5701b52391162abfb2d6d14c6295fa8a16687		 pdf-font-stream PDF embedded font (sfnt) at offset 0x549C 6444 bytes
font_02_sfnt_off00006416.bin
eec464309fcf18835f7a01aa168516e8c51d14110087fc09f009c7839578d76e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6416 16188 bytes

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