Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4366535be6130a1…

MALICIOUS

PDF

48.5 KB Authoring application: SWFTools
MD5: 9855479122c1d1127c574e4d2fedd6bf SHA-1: 9ee6c24797579cfa32af18bdc57cedcf7b129bc8 SHA-256: a4366535be6130a1f9240469b1b0ee9b192ac6b8d8c549d3ae3bd30b06c28bd2
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, as detected by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier also indicate maliciousness. The primary attack pattern involves redirecting users to a multitude of PDF files hosted on various domains, likely for SEO spam or to distribute further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://barrons-independent.com/uploads/1/3/0/5/130551331/zitulifotul.pdf
    • http://tinek.systav.xyz/uploads/2020/01/28/tikusupiginuf-jemabel-lagojafizij-ramenidatubil.pdf
    • http://mychicagorides.com/uploads/1/3/0/2/130287482/5211884.pdf
    • http://solarlandscapes.net/uploads/1/3/0/6/130639398/ginixoxevud-roped-jalizube-rabopimoju.pdf
    • https://taxuvizo.weebly.com/uploads/1/3/0/2/130291328/filot_xamomudisipumu_zepelofupolo.pdf
    • http://chaiyee.com/uploads/1/3/0/2/130288861/vegakikuwif-zaveresevex.pdf
    • http://nataliefernadez.com/uploads/1/3/0/2/130287318/papabitogeben.pdf
    • http://mymoneybuilder.com/uploads/1/3/0/3/130323328/8853247.pdf
    • http://nbtatco.com/uploads/1/3/0/5/130551325/fubikonelel.pdf
    • http://bossalaus.com/uploads/1/3/0/4/130488846/xanugomul.pdf
    • http://angelschic.com/uploads/1/3/0/7/130776346/doduno.pdf
    • http://michelleislivingwell.com/uploads/1/3/0/2/130289335/lepaxuforoson.pdf
    • http://rebeccalaplacaattia.com/uploads/1/3/0/6/130604808/130604808.html#appsc+group+4+previous+papers+pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001515.bin
c3d9015def7244a24172fc5200575cc79ae8420e7b1e662ad57d99c0d5720906		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1515 8560 bytes
font_01_sfnt_off00007739.bin
c6c28444bcd94379862b6cc7f8cfcdbcdaeb026857ccdb099d87626a561054a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7739 16092 bytes

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