Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a677ec3e5e8b22…

MALICIOUS

PDF

37.9 KB Authoring application: Nitro PDF First seen: 2020-09-07
MD5: fe6168688900f429233536eade697c4c SHA-1: e5f655367d7563598f114448eb141bab7ca8d090 SHA-256: 85a677ec3e5e8b22d7e3efe4064e1fd730b7e36559a72e290a487a4172a60c13
172 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, directing users to other PDF files hosted on various domains. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam context, further supported by the ML classifier's high confidence in maliciousness. The embedded URLs are likely used to deliver a second-stage payload or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://mugaxapaso.pvhporuch.ru/uploads/2020/01/28/jixofejowop.pdf In PDF document text
    • http://nuamescounseling.weebly.com/uploads/1/3/0/2/130272850/42f4264114.pdfIn PDF document text
    • https://ravugukewapiso.weebly.com/uploads/1/3/0/4/130435631/7995331.pdfIn PDF document text
    • https://kajukosow.weebly.com/uploads/1/3/0/2/130271041/sogitutuketemub.pdfIn PDF document text
    • http://iamthemuseum.com/uploads/1/3/0/5/130540193/46f39d71080.pdfIn PDF document text
    • http://lakegenevapsychologist.com/uploads/1/3/0/6/130621801/3852608.pdfIn PDF document text
    • http://bodyworkbybarb.com/uploads/1/3/0/6/130639551/130639551.html#sky+star+gold+tv+guideIn PDF document text
    • http://linux.thai.net/projects/fonts-tlwgIn PDF document text
    • http://www.thaitux.infoIn PDF document text
🗂 Part of campaign: excelappdevelopment.com 12 samples

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB 8468 bytes
SHA-256: 806a8e90b4631e4300b20fd5675b2a8d05208138daa207719365faebae94d6f8
font_01_sfnt_off00004db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DB9 9744 bytes
SHA-256: c9655644a945a2bc46672e4d4588f8b8f0381e8adfc868cce1c18b57f13076a9

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