Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a932b0adb527fd5…

MALICIOUS

PDF

37.7 KB Authoring application: pstoedit
MD5: f8439019b45dfcc71140f8692b75ca9b SHA-1: 4e06bb4824e19474b72e426838a0613700b5144c SHA-256: 1a932b0adb527fd53373146369c10d334d66bac9c5275e829ceed6b2aa86c022
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs pointing to external PDF files, a technique often used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate maliciousness. The heuristic PDF_SEO_LINK_FARM specifically identifies the mass external PDF link farm, with the dominant host being alinazhukovskaya.com.

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://alinazhukovskaya.com/uploads/1/3/0/3/130379673/4984c.pdf
    • http://therachelsue.com/uploads/1/3/0/6/130604305/a9a8f6ae.pdf
    • http://movingforwardtogethertoday.com/uploads/1/3/0/6/130603823/9394749.pdf
    • http://goodshepherdbraddock.org/uploads/1/3/0/4/130436204/d3336841c642.pdf
    • http://minimalwaste.net/uploads/1/3/0/4/130435876/96e1ae358daeef4.pdf
    • http://bowup.yogakub.ru/uploads/2020/01/28/moxuberexuteju-jisusugakuz.pdf
    • http://bodyworkbybarb.com/uploads/1/3/0/5/130543170/130543170.html#how+to+read+dew+point+temperature+on+psychrometric+chart

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000115a.bin
67995ba120d9197bfab6703fbd1ef395a2aef9c9ce54a2660850328014f396a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115A 8764 bytes

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