Malicious PDF — malware analysis report

Static analysis result for SHA-256 f121a0f8deca7783…

MALICIOUS

PDF

46.4 KB Authoring application: Smallpdf Desktop
MD5: 1dca7553dc5843d04b7cd8d43f84bfb0 SHA-1: 474f7e9fee52d5cbc79e384df813cdcd1f69125a SHA-256: f121a0f8deca778324803f83fad5c5b7577e918bb4c9248f252f0b5db76d9379
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The primary heuristic identified a large 'SEO link farm' containing 24 external PDF links, with the first being http://nwabaseball.com/uploads/1/3/0/4/130483573/vipedu.pdf. This suggests the document is designed to distribute or link to other malicious content, potentially for phishing or malware distribution, rather than for legitimate informational purposes.

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://nwabaseball.com/uploads/1/3/0/4/130483573/vipedu.pdf
    • http://jymstringer.com/uploads/1/3/0/4/130436367/xaxikototew-govozibawikirel.pdf
    • http://cpr-trainingclasses.net/uploads/1/3/0/3/130379506/a44bf77.pdf
    • http://my-safety-box.com/uploads/1/3/0/4/130483872/dadogafo_duvigamitu_pupekenetuwebif.pdf
    • http://vipiski-egrn3.icu/uploads/2020/01/29/9992473.pdf
    • http://douglaspharmachems.com/uploads/1/3/0/6/130620506/benizew-tenajetewuzel-panejozog.pdf
    • http://mhrandlenovels.com/uploads/1/3/0/5/130540049/fapazapajoba.pdf
    • http://modafabrictreasure.co.uk/uploads/1/3/0/6/130604069/vokepadaxiser.pdf
    • http://madeinvenicemovie.net/uploads/1/3/0/5/130539599/mumilekabuvat.pdf
    • http://positivelypolyanna.weebly.com/uploads/1/3/0/4/130435745/220054.pdf
    • http://ontrackrti.net/uploads/1/3/0/7/130739158/kasezu_wumobikobenopo_sunewoz_busupuwamenij.pdf
    • http://misbailes.com/uploads/1/3/0/5/130542996/130542996.html#attendance+management+solution+p206
    • http://agrossen.myhostpoint.ch/uploads/1/3/0/5/130544754/739229.pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001411.bin
d153ca6922b731727525bfeb9add967254a6df0f5ee830625626a2ea92892f2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1411 9400 bytes

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