Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bcb6fdf53cbf94d…

MALICIOUS

PDF

40.2 KB Authoring application: Nitro PDF
MD5: 3787dd86c739b89b6af88136f1bff921 SHA-1: 6e22a044babb142426a8a8da070c960a9f77d253 SHA-256: 7bcb6fdf53cbf94dbf2de7517f25953a290a420ddbab384dd0afcb45563729d3
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and a machine learning classifier, for malicious content. The PDF_SEO_LINK_FARM heuristic identified a large number of embedded external links, with the first identified link being http://schoolchoicevermont.com/uploads/1/3/0/3/130379174/nutenoxitot.pdf. This suggests the document's primary purpose is to act as a lure, redirecting users to potentially malicious sites. No scripts were extracted from this sample.

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 http://schoolchoicevermont.com/uploads/1/3/0/3/130379174/nutenoxitot.pdf
    • http://krissyoneill.com/uploads/1/3/0/2/130289793/dazujexaro.pdf
    • http://vamekerbanks.com/uploads/1/3/0/2/130287872/10b10725f.pdf
    • http://alexbchin.com/uploads/1/3/0/6/130621412/9986215.pdf
    • http://applyfordisabilitynow.us/uploads/1/3/0/3/130313504/520718.pdf
    • http://murrietasalvationarmy.org/uploads/1/3/0/2/130287221/5a763d258e7768.pdf
    • http://nuobeijinghotel-chinese.devsite-1.com/uploads/1/3/0/2/130289763/xapifiwosalegabot.pdf
    • http://paulaweeksinternational.com/uploads/1/3/0/5/130588307/sagenetabipafot.pdf
    • http://taxperks.net/uploads/1/3/0/4/130476795/fffe212.pdf
    • http://mypartypro.net/uploads/1/3/0/4/130476068/waboladeloru.pdf
    • http://shrinedads.com/uploads/1/3/0/5/130588239/wenodib.pdf
    • http://stuccovenetiano.com/uploads/1/3/0/6/130604492/gomadojil.pdf
    • http://anthonybeastmode.com/uploads/1/3/0/4/130477661/fibinazevozejes.pdf
    • http://hochu-apple.com/uploads/2020/01/28/b44d8b41fa9c5f4.pdf
    • http://cjconcep.art/uploads/1/3/0/4/130488861/119d76bc090bbe.pdf
    • http://gife.shopdochoi.tech/uploads/2020/01/27/pawabebak.pdf
    • http://ncsdactivities.com/uploads/1/3/0/5/130589444/revuz_rusubaze_sorunaluzume.pdf
    • http://shardexplorers.com/uploads/1/3/0/6/130639729/130639729.html#cara+buat+cold+brew+manual

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001490.bin
f6086faeda802c0c94c382032661a6dd5970dd670eb0447cb6d28d61a3729c85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1490 7520 bytes
font_01_sfnt_off00006245.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6245 1708 bytes

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