Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca80d2336fdeb84…

MALICIOUS

PDF

33.5 KB Authoring application: Smallpdf Desktop
MD5: 014d0874f3aadd649921b7b65c10df4a SHA-1: a7492be9fa04f50d36540616756482fde4c258b2 SHA-256: dca80d2336fdeb84cab685f8f60c413f1f02e0c5fc08116cf3a19a7aca9a3bb3
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ClamAV as 'Pdf.Phishing.TtraffRobotInstall-7605656-0', and a machine learning classifier. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of external links, with the primary example being http://thegentlemansfarm.net/uploads/1/3/0/4/130483478/9309073.pdf. This suggests the document is designed to lure users to malicious sites or to manipulate search engine rankings.

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://thegentlemansfarm.net/uploads/1/3/0/4/130483478/9309073.pdf
    • http://orangeparktreeservice.com/uploads/1/3/0/4/130436093/6001298.pdf
    • http://octaviusmagazine.com/uploads/1/3/0/6/130620172/ranawu.pdf
    • http://arkcityepiscopal.com/uploads/1/3/0/6/130605152/gidujomojix.pdf
    • http://totumiwu.aion.fun/uploads/2020/01/29/2b054ee.pdf
    • http://immediateinsight.net/uploads/1/3/0/6/130639521/7d656d8a010.pdf
    • http://merryhillweddings.net/uploads/1/3/0/2/130271038/tuzawimuna.pdf
    • http://bergencountyfieldhockey.com/uploads/1/3/0/7/130739052/130739052.html#past+simple+vs+present+perfect+agendaweb

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000114c.bin
c64365777589487b1b4810b3dfdbae1c2dffca295259e0558c35c79d17035ae8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114C 8148 bytes

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