Malicious PDF — malware analysis report

Static analysis result for SHA-256 5908367ad5545668…

MALICIOUS

PDF

41.5 KB Authoring application: Smallpdf Desktop
MD5: a45c5808e373938fcfe70e4cd54705d2 SHA-1: 37be41f13df69f4f6c85d4d81a2ea30d4d77efd4 SHA-256: 5908367ad5545668f461bcef048342e2497da3161d3ff32f8655c878d2f53f79
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and a machine learning classifier, indicating malicious intent. The primary attack pattern identified is a 'PDF_SEO_LINK_FARM', which involves embedding a large number of external links within the document. These links, such as http://middleburyactors.com/uploads/1/3/0/2/130274263/47a4f460c89.pdf, are likely designed to redirect users to phishing sites or download 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://middleburyactors.com/uploads/1/3/0/2/130274263/47a4f460c89.pdf
    • http://nrgcleaning.com/uploads/1/3/0/2/130271152/purimog_bikovaguna_favafoxejus.pdf
    • http://jole.excelorbit.in/uploads/2020/01/29/8162838.pdf
    • http://capehomerepair.com/uploads/1/3/0/5/130543006/wurisa.pdf
    • http://abingtonpolishing.com/uploads/1/3/0/6/130604467/zexadosebuje.pdf
    • http://dipumu.thaimanohra.com/uploads/2020/01/29/fokulobeg.pdf
    • https://tuwenugajas.weebly.com/uploads/1/3/0/2/130271077/0028c.pdf
    • http://barrysatvadventures.com/uploads/1/3/0/5/130589180/1199619.pdf
    • http://tvoijem.fun/uploads/2020/01/29/8967533.pdf
    • http://vetpoint.org/uploads/1/3/0/6/130604945/kovix-jexivafomopaw-zuridinuwiwize-pugafifezukig.pdf
    • http://mkcinvestmentsllc.com/uploads/1/3/0/5/130590702/3340c987d.pdf
    • http://kellycarmichaelbooz.com/uploads/1/3/0/5/130539455/jufewibegoba.pdf
    • http://nvarealestateresource.com/uploads/1/3/0/4/130476709/tamage.pdf
    • http://nahsesouthflorida.org/uploads/1/3/0/6/130620325/91c32d5c27e1a.pdf
    • http://zik.pokupka-perfecto.ru/uploads/2020/01/28/edc5cc8f3dc455.pdf
    • https://xagewezosoni.weebly.com/uploads/1/3/0/4/130435877/falaz-gawawu.pdf
    • http://mind4age.com/uploads/1/3/0/3/130313022/945616bd52a42.pdf
    • http://schallisflyfishing.de/uploads/1/3/0/4/130483540/130483540.html#wheel+of+time+book+13+pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001555.bin
8723537457a372b9894d1139d536072198950f0ba8b8c9713cdd92d816761ff1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1555 9160 bytes

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