Malicious PDF — malware analysis report

Static analysis result for SHA-256 4099a994ab0e23f0…

MALICIOUS

PDF

185.3 KB Created: 2015-07-24 11:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.2.1 (via Qt 4.8.6)
MD5: b66d7f87e2176d02f88afacfbb506a69 SHA-1: 2438222c99b7de40304ef093ce692372dfacf00d SHA-256: 4099a994ab0e23f03fce2db8e14c4928d40c64c2becf460d68173c43007fcf57
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to botcraftman.ru. This indicates the document is designed to lure users to a malicious site. The ML classifier also strongly flagged this PDF as malicious. ClamAV detection confirms this, identifying it as Pdf.Dropper.Agent-8786572-0. No scripts were extracted, but the presence of a malicious redirector URL is sufficient evidence of a malicious intent to deliver a payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Dropper.Agent-8786572-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8786572-0
  • 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://botcraftman.ru/?lip&keyword=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%BF%D0%BE%D1%80%D0%BD%D0%BE+%D0%BD%D0%B0+%D0%B0%D0%B9%D1%84%D0%BE%D0%BD&charset=utf-8
    • http://fastpic.ru/
    • http://www.liveinternet.ru/click
    • http://img1.liveinternet.ru/images/attach/c/5//4189/4189854_klyuch_dlya_norton_internet_sekyuriti.pdf
    • http://img1.liveinternet.ru/images/attach/c/5//4185/4185618_maykrosoft_ofis_2010_skachat_besplatno_dlya_windows_7.pdf
    • http://img1.liveinternet.ru/images/attach/c/5//4185/4185561_dzhon_grey_muzhchinuy_s_marsa_zhenschinuy_s_veneruy_audiokniga.pdf

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000243d6.bin
880e53e6f12106514012eaabb19a261b9f8ae03d695445fc59a5b9b5a1293281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x243D6 3556 bytes
font_01_sfnt_off00025159.bin
265d2e7f9cdd2f9afe0f9038b196b5aafb4fd6e85c222a13b1c9199ce21e80c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25159 14480 bytes
font_02_sfnt_off00027edc.bin
c33e6903d76079777c1b082a355654bfa5653b97afd40bc3e5344b34556d24bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x27EDC 14468 bytes
font_03_sfnt_off0002a98e.bin
c9157b21ddc9f45aadb20a5bc817a85227a45464066271061230f5f209a061f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2A98E 6260 bytes
font_04_sfnt_off0002bb37.bin
819f9cc5156bfe3dae03045446d677a19b5879270357875344f9514601da73e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2BB37 6084 bytes
font_05_sfnt_off0002cacc.bin
9364d8c42993f0db1eb41a63b15a48dd56cef5056a611ab8e91dd81183a5a95e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2CACC 3752 bytes

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