Malicious PDF — malware analysis report

Static analysis result for SHA-256 a438bb3f5b9e7a20…

MALICIOUS

PDF

45.2 KB Authoring application: pstoedit
MD5: 2d43e5b2463ccb70f7d0404293975ce8 SHA-1: 24297f5000ca761484ee95701c4979757f2a785f SHA-256: a438bb3f5b9e7a20c5df805d2d3248e8d57cc50f72344dafaffd61f23e617c00
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various external domains. The document body, though partially corrupted, mentions "Acronis true image cloning software", suggesting a lure to attract clicks. ClamAV detection and the ML classifier further confirm its malicious nature as a dropper.

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.Dropper.Agent-7716133-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7716133-0
  • 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://uprradiology.org/uploads/1/3/0/3/130313698/0228f71ba.pdf
    • http://7magicflower.com/uploads/1/3/0/5/130551775/14458cd6.pdf
    • http://desrochersculpturestudio.com/uploads/1/3/0/4/130476079/6607853.pdf
    • http://lancelinroadhouse.com/uploads/1/3/0/3/130379912/begusifage.pdf
    • http://scw8whedonstudiestv.com/uploads/1/3/0/4/130488539/397e52e9.pdf
    • http://hodllife.ca/uploads/1/3/0/2/130274330/gerigip.pdf
    • http://alrt.store/uploads/1/3/0/4/130435597/130435597.html#acronis+true+image+cloning+software

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010e4.bin
4fe25331a5c1dd9b996b77c29661853164b9d7864a2467e8b01ca80d150c28e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4 8544 bytes
font_01_sfnt_off00006b2f.bin
f335bbb8769c533cbca16f6384a9be7e2e65528b9693bf598f9b6a21ed261b2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B2F 16036 bytes

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