Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be64d5dbcfc5541…

MALICIOUS

PDF

44.5 KB Authoring application: Nitro PDF First seen: 2021-07-10
MD5: cfe88748897b6f71162d8127abc6d622 SHA-1: 25489e80dbcf2b90647d78a96fee012126930287 SHA-256: 3be64d5dbcfc5541fb37d58ca417745f9f29fe17b18a7edd44642f7a427548b1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are structured as a link farm, and a heuristic detected a visual download button. ClamAV identified the file as 'Pdf.Phishing.TtraffRobotInstall-7605656-0', indicating a phishing or malware distribution attempt. The embedded URLs likely lead to malicious content or further phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://panajefitu.slepttava.xyz/uploads/2020/01/28/4663113.pdf In PDF document text
    • http://fenurega.kangaroo-shop.ru/uploads/2020/01/28/9527146.pdfIn PDF document text
    • http://rigis.prontoconsegna.it/uploads/2020/01/28/8f35a08c.pdfIn PDF document text
    • http://divupimeve.interio-mosaic.ru/uploads/2020/01/28/2213288.pdfIn PDF document text
    • http://halinsy.online/uploads/2020/01/28/zolul.pdfIn PDF document text
    • http://web-delo.icu/uploads/2020/01/27/414489.pdfIn PDF document text
    • http://korixejax.raz-ezzhaya.ru/uploads/2020/01/27/467710.pdfIn PDF document text
    • https://baxesaxanog.weebly.com/uploads/1/3/0/5/130588220/130588220.html#10th+tamil+guide+pdf+free+download+2019In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098 7644 bytes
SHA-256: a5071ebdb4a7d9ebb28df97d8989a5563e5dfcefa9fad9e2cbb22397464a168e
font_01_sfnt_off0000542e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x542E 15504 bytes
SHA-256: c5044a39f52b06ff690aac04d642e967b2f4ffda02efaf24fd0ff728287b5df1

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