Malicious PDF — malware analysis report

Static analysis result for SHA-256 f657a5736005aeca…

MALICIOUS

PDF

52.4 KB Authoring application: Smallpdf Desktop
MD5: e162a83640e26d3868c8099c3b344c81 SHA-1: 4abf3894f11e933ed67b67c25e8c5f7a9f415317 SHA-256: f657a5736005aecae14674698897a1c6d287b5a33ab5dcc378766a30a4a5c048
152 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. This suggests a link farm or a distribution mechanism for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted from this sample.

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://cairnsclassictours.com/uploads/1/3/0/5/130588732/4041605.pdf
    • http://nattertowing.com/uploads/1/3/0/5/130550763/todod.pdf
    • http://ted.pvhporuch.ru/uploads/2020/01/29/moxenej.pdf
    • http://derwoodmarket.org/uploads/1/3/0/6/130620840/5fb2de2d9b.pdf
    • http://christinareid.net/uploads/1/3/0/2/130288642/564539.pdf
    • http://nelaras.icgauthbanquepoportail.com/uploads/2020/01/28/dewomonetugulam.pdf
    • http://ololparish.org/uploads/1/3/0/2/130291662/936490.pdf
    • http://congresoestetica.com/uploads/1/3/0/6/130620536/jowixesi.pdf
    • http://chatfieldswimdive.weebly.com/uploads/1/3/0/6/130604696/5b5d774fe7b.pdf
    • http://spiritchile.net/uploads/1/3/0/5/130590463/vijikiguvosu.pdf
    • http://centerforculturalfitness.org/uploads/1/3/0/4/130436494/130436494.html#uncharted+4+for+better+or+worse

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000122b.bin
261cc531cfcf83682d6b0131cba969daba7e2991a2a7217012d7e05d64e829ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122B 8092 bytes
font_01_sfnt_off00008060.bin
0a19d3ec01c2bd5f2da2e654894ff9caac3df97291af1acb5ff150be3e6b34cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8060 18100 bytes

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