Malicious PDF — malware analysis report

Static analysis result for SHA-256 af79e4610b29fa13…

MALICIOUS

PDF

50.1 KB Authoring application: LibreOffice Draw
MD5: 18f5e928fb26a7a82143a3785100acbb SHA-1: 418be93063be3f921a08c1166bf177d70b67c6f7 SHA-256: af79e4610b29fa134c754f1b51e5f9086b235844f29caf735256c92bd3aad771
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links to external PDF files, a technique often used for SEO poisoning or to distribute malicious content. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier output strongly indicate malicious intent. The document body, though heavily corrupted, mentions 'Methodology of teaching english to young learners pdf', which may be a lure to disguise the malicious nature of the links.

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://vizcademy.com/uploads/1/3/0/6/130639461/jisebawo.pdf
    • http://jamesagibson.com/uploads/1/3/0/3/130379485/60a663094.pdf
    • http://jonathanecollins.com/uploads/1/3/0/4/130476628/6388882.pdf
    • http://www.angels-whispers.com/uploads/1/3/0/5/130590663/weluk.pdf
    • http://yasr.com/uploads/1/3/0/6/130604523/70faa2.pdf
    • http://www.poetrinmotion.com/uploads/1/3/0/7/130740458/7889269.pdf
    • http://nederland-verzilvert.nl/uploads/1/3/0/4/130435553/zalifexomef-mesaga-muxaxoz.pdf
    • http://misshitch.net/uploads/1/3/0/6/130622103/2159689.pdf
    • http://www.myhudsonair.com/uploads/1/3/0/3/130323130/7371844.pdf
    • http://newmarketviolinstudio.com/uploads/1/3/0/5/130551576/palegaru.pdf
    • http://wimberlesque.com/uploads/1/3/0/9/130969647/9443812.pdf
    • http://ccbucciero.com/uploads/1/3/0/4/130488311/891760.pdf
    • http://realitycure.com/uploads/1/3/0/6/130621608/jomijoj-tomira-nobunifazenike-resek.pdf
    • http://vantagetactical.net/uploads/1/3/0/4/130483396/zusilofumi.pdf
    • http://www.paralectures.net/uploads/1/3/0/5/130545882/7612961.pdf
    • http://espanolvistarealguatemala.devsite-1.com/uploads/1/3/0/6/130605059/130605059.html#methodology+of+teaching+english+to+young+learners+pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051fc.bin
5d6225cbdc4288516ed7fbc301dd3fbd9b41a0934790722d8e3da1cedfe45191		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51FC 16268 bytes
font_01_sfnt_off00006a4c.bin
165fa079fa49c03f1dbbfcc879eb6cc666a329d1a1b61386570f252a1930a543		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A4C 7832 bytes

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