Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3a5b8dffd62fef…

MALICIOUS

PDF

40.7 KB Authoring application: LibreOffice
MD5: 0042065311bd9166c57946b8ded1ba0c SHA-1: 64c52a4fd249746691793db4769649ca76ccf4cd SHA-256: bf3a5b8dffd62fef84d84e1c978b6eedce05b9a0d5017450a2dc92ab60a1dc4f
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. This suggests a phishing or SEO manipulation attempt. The ClamAV detection as Pdf.Phishing.TtraffRobotInstall-7605656-0 further supports a malicious intent. No scripts were extracted from this sample, and the document body content is heavily corrupted, making it difficult to ascertain the exact lure.

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 https://sasurejojutim.weebly.com/uploads/1/3/0/2/130270974/4459645.pdf
    • http://cabinaselshaddai.com/uploads/1/3/0/5/130590351/zawiputilo.pdf
    • http://longnecklagooneec.com/uploads/1/3/0/6/130621165/7767166.pdf
    • http://eccochambermusic.org/uploads/1/3/0/5/130541745/fijal.pdf
    • http://milub.olikx.xyz/uploads/2020/01/27/gemavuluninuwoba.pdf
    • http://cavalierspublishing.com/uploads/1/3/0/7/130776886/9f685886976.pdf
    • http://mkrbd.net/uploads/1/3/0/6/130622032/zepizonamususiv.pdf
    • http://institutoinec.net/uploads/1/3/0/3/130324351/remalamalumotaxiza.pdf
    • http://chaletalpemassif.com/uploads/1/3/0/2/130289262/gebanev-wewakawatojax.pdf
    • http://foothillsbiblefellowship.com/uploads/1/3/0/2/130288710/130288710.html#cooler+master+hyper+212+led+install+am4

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001253.bin
ec50fa5576da75b9e7b708f36bea3c3754e58790cd78bac7939def5c94764cfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1253 9120 bytes
font_01_sfnt_off000058d1.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58D1 16036 bytes

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