Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b7e1c155134612…

MALICIOUS

PDF

45.5 KB Authoring application: pstoedit
MD5: d797a08fc0133f0acea1908e1e2ddddd SHA-1: 9033bcdc288e461edcd58585642629cea8e35b79 SHA-256: b6b7e1c1551346126cc740c658616ac38588e9b9f16dd935784c4114cc560095
150 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. The critical PDF_SEO_LINK_FARM heuristic indicates the presence of a large number of external links, with the primary domain being 5weeksto140.com. The embedded URLs and the heuristic strongly suggest a phishing or SEO spam campaign designed to redirect users to potentially 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://5weeksto140.com/uploads/1/3/0/6/130620601/429731e.pdf
    • http://valcom.tv/uploads/1/3/0/7/130739290/kumabupawufamize.pdf
    • http://alpurpletaxi.com/uploads/1/3/0/2/130288444/4677402.pdf
    • http://globaly.net/uploads/1/3/0/5/130590180/565e036b3270c1.pdf
    • http://difumu.pharmaexpo.tech/uploads/2020/01/29/fd6c84c7db.pdf
    • https://lotezarajiworo.weebly.com/uploads/1/3/0/6/130604406/27472e1ae.pdf
    • http://nesretreat.com/uploads/1/3/0/2/130271048/596c7eb.pdf
    • http://backtopulse.com/uploads/1/3/0/5/130550971/a2dc6.pdf
    • http://hrtechpro.org/uploads/1/3/0/6/130604621/tekel-noxakav-benuba.pdf
    • http://newparanormalsociety.com/uploads/1/3/0/5/130588611/a769b2dafb7899.pdf
    • http://cogcomp.com/uploads/1/3/0/6/130604067/tumixomap.pdf
    • http://edgelandscapeandmaintenance.com/uploads/1/3/0/7/130776481/130776481.html#brush+up+english+grammar+pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000129b.bin
86e8fc5a7debeb2e2817c58499d209fc654b68839c22d417cb18f95ffdae9210		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129B 8808 bytes
font_01_sfnt_off00006835.bin
9dbefd29ad56edc3ec27c88540d7d41398a664ae3f1544cdca53ccca226c91b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6835 10764 bytes

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