Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce743f4a9f729705…

MALICIOUS

PDF

33.2 KB Authoring application: QPDF
MD5: f51fd08748306d34a2fb73fd2701ebc3 SHA-1: 599b81c8386ee282045715e2099d4b6eea5b1d4a SHA-256: ce743f4a9f72970527d8c10842a5dcecf1a381cb31a4d45f1a14812c3f45b373
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a phishing or redirection campaign. The ClamAV detection as Pdf.Phishing.TtraffRobotInstall-7605656-0 further supports this. The embedded document body text mentions 'Jblearning quiz answers' and includes multiple URLs, reinforcing the lure. No scripts were extracted from this sample.

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://sperorebuilt.com/uploads/1/3/0/6/130639153/6428200.pdf
    • http://oidso.net/uploads/1/3/0/7/130775443/3162849.pdf
    • http://veb.icgauthbanquepoportail.com/uploads/2020/01/28/5247425.pdf
    • http://rentprivatemoney.com/uploads/1/3/0/5/130541624/zipagiw-sunodobutogov-zejedax-xeputo.pdf
    • http://rosepalmerlaw.com/uploads/1/3/0/5/130588658/nogufevu_pulajowimawe.pdf
    • http://southerncaliforniamortgage.net/uploads/1/3/0/4/130489265/3377219.pdf
    • http://nuohotel-zh.devsite-1.com/uploads/1/3/0/5/130543293/130543293.html#jblearning+quiz+answers

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010e6.bin
767cd3f1d2db5bc2802954dafe1d567ca7a228f502c8aff9ed9a911f9c3f6d96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6 8112 bytes

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